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. 1: https://lwn.net/ml/linux-kernel/20180703094309.18514-1-mylene.josserand@xxxxxxxxxxx/ 2: https://github.com/alistair23/linux/commits/rM2-mainline-cyttsp5-hid Alistair Francis (2): ARM: imx_v6_v7_defconfig: Enable the cyttsp5 touchscreen ARM: dts: imx7d: remarkable2: Enable the cyttsp5 Mylène Josserand (2): Input: Add driver for Cypress Generation 5 touchscreen Documentation: DT: bindings: input: Add documentation for cyttsp5 .../input/touchscreen/cypress,tt21000.yaml | 92 ++ arch/arm/boot/dts/imx7d-remarkable2.dts | 89 ++ arch/arm/configs/imx_v6_v7_defconfig | 1 + drivers/input/touchscreen/Kconfig | 14 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/cyttsp5.c | 1135 +++++++++++++++++ 6 files changed, 1332 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml create mode 100644 drivers/input/touchscreen/cyttsp5.c -- 2.31.1
