On Thu, Dec 16, 2021 at 3:36 PM Tim Harvey <tharvey@xxxxxxxxxxxxx> wrote: > > The DFROBOT DFR0678 [1] and DFR0550 [2] touchscreen displays are meant > to be compatible with the official RaspberryPi 7in display. However > instead of directly conntecting the FT5x06 touch controller to the I2C > bus going to the host processor they route it through an MCU and emulate > a virtual FT5x06 controller but don't do a very good job at it. The > method the RaspberryPi firmware used to read the touch data is supported > (which consists of reading R2 to get the number of touch points, then > reading 4 bytes of data for each point in discrete I2C transactions. If > you try to use the FT5x06 driver which reads all registers starting at > R0 at once you will get invalid point data. > > This controller lacks an interrupt and does not send UP events so > polling mode is used and event ID tracking is used to emulate UP events. > > This series adds dt bindings and a standalone driver for this touch > controller as opposed to an RFC series I sent out that attempts to add > support to the existing edt-ft5x06 driver. > > Tim > [1] - https://www.dfrobot.com/product-2193.html > [2] - https://www.dfrobot.com/product-1784.html > > Tim Harvey (3): > dt-bindings: Add vendor prefix for DFRobot > dt-bindings: touchscreen: Add dfr0550 bindings > input: touchscreen: add dfr0550 support > > .../bindings/input/touchscreen/dfr0550.yaml | 53 +++++ > .../devicetree/bindings/vendor-prefixes.yaml | 2 + > MAINTAINERS | 5 + > drivers/input/touchscreen/Kconfig | 12 + > drivers/input/touchscreen/Makefile | 1 + > drivers/input/touchscreen/dfr0550.c | 208 ++++++++++++++++++ > 6 files changed, 281 insertions(+) > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/dfr0550.yaml > create mode 100644 drivers/input/touchscreen/dfr0550.c > Any feedback on this? The other approach I posted an RFC series for was to add support to the existing edt-ft5x06 driver [1]. Best regards, Tim [1] https://patchwork.kernel.org/project/linux-input/list/?series=596977
