On Wed, Nov 18, 2015 at 06:31:39PM +0200, Irina Tirdea wrote:
> Add ESD (Electrostatic Discharge) protection mechanism.
>
> The driver enables ESD protection in HW and checks a register
> to determine if ESD occurred. If ESD is signalled by the HW,
> the driver will reset the device.
>
> The ESD poll time (in ms) can be set through the sysfs property
> esd_timeout. If it is set to 0, ESD protection is disabled.
> Recommended value is 2000 ms. The initial value for ESD timeout
> can be set through esd-recovery-timeout-ms ACPI/DT property.
> If there is no such property defined, ESD protection is disabled.
> For ACPI 5.1, the property can be specified using _DSD properties:
> Device (STAC)
> {
> Name (_HID, "GDIX1001")
> ...
>
> Name (_DSD, Package ()
> {
> ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> Package ()
> {
> Package (2) { "esd-recovery-timeout-ms", Package(1) { 2000 }},
> ...
> }
> })
> }
>
> The ESD protection mechanism is only available if the gpio pins
> are properly initialized from ACPI/DT.
>
> This is based on Goodix datasheets for GT911 and GT9271 and on Goodix
> driver gt9xx.c for Android (publicly available in Android kernel
> trees for various devices).
>
> Signed-off-by: Irina Tirdea <irina.tir...@intel.com>
> ---
> .../bindings/input/touchscreen/goodix.txt | 6 +
For the binding:
Acked-by: Rob Herring <r...@kernel.org>
> drivers/input/touchscreen/goodix.c | 160
> ++++++++++++++++++++-
> 2 files changed, 161 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> index 7137881..4db3393 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> @@ -14,6 +14,12 @@ Required properties:
> - interrupts : Interrupt to which the chip is connected
> - irq-gpio : GPIO pin used for IRQ
> - reset-gpio : GPIO pin used for reset
> +Optional properties:
> +
> + - esd-recovery-timeout-ms : ESD poll time (in milli seconds) for the driver
> to
> + check if ESD occurred and in that case reset the
> + device. ESD is disabled if this property is not
> set
> + or is set to 0.
>
> Example:
>
--
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