| From: |
| Alistair Francis <alistair-AT-alistair23.me> |
| To: |
| linux-arm-kernel-AT-lists.infradead.org, linux-kernel-AT-vger.kernel.org, devicetree-AT-vger.kernel.org, linux-input-AT-vger.kernel.org |
| Subject: |
| [PATCH v6 0/4] Add support for the Cypress cyttsp5 |
| Date: |
| Sun, 27 Feb 2022 22:33:14 +1000 |
| Message-ID: |
| <20220227123318.313009-1-alistair@alistair23.me> |
| Cc: |
| robh+dt-AT-kernel.org, linus.walleij-AT-linaro.org, rydberg-AT-bitmath.org, dmitry.torokhov-AT-gmail.com, andreas-AT-kemnade.info, alistair23-AT-gmail.com, Alistair Francis <alistair-AT-alistair23.me> |
| Archive-link: |
| Article |
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-my...
2: https://github.com/alistair23/linux/commits/rM2-mainline-...
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 | 98 ++
arch/arm/boot/dts/imx7d-remarkable2.dts | 97 ++
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, 1115 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
create mode 100644 drivers/input/touchscreen/cyttsp5.c
--
2.34.1
