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On some x86 tablets with a silead touchscreen the windows logo on the front is a capacitive home button. Touching this button results in a touch with bits 12-15 of the Y coordinates set, while normally only the lower 12 are used. Detect this and report a KEY_LEFTMETA press when this happens. Note for now we only respond to the Y coordinate bits 12-15 containing 0x01, on some tablets *without* a capacative button I've noticed these bits containing 0x04 when crossing the edges of the screen. Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
* GSL 1680 touchscreen controller
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Required properties:
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- compatible : Must be one of the following, depending on the model:
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"silead,gsl1680"
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"silead,gsl1688"
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"silead,gsl3670"
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"silead,gsl3675"
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"silead,gsl3692"
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- reg : I2C slave address of the chip (0x40)
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- interrupt-parent : a phandle pointing to the interrupt controller
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serving the interrupt for this chip
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- interrupts : interrupt specification for the gsl1680 interrupt
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- power-gpios : Specification for the pin connected to the gsl1680's
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shutdown input. This needs to be driven high to take the
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gsl1680 out of its low power state
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- touchscreen-size-x : See touchscreen.txt
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- touchscreen-size-y : See touchscreen.txt
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Optional properties:
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- firmware-name : File basename (string) for board specific firmware
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- touchscreen-inverted-x : See touchscreen.txt
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- touchscreen-inverted-y : See touchscreen.txt
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- touchscreen-swapped-x-y : See touchscreen.txt
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- silead,max-fingers : maximum number of fingers the touchscreen can detect
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- silead,home-button : Boolean, set to true on devices which have a
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capacitive home-button build into the touchscreen
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- vddio-supply : regulator phandle for controller VDDIO
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- avdd-supply : regulator phandle for controller AVDD
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Example:
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i2c@00000000 {
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gsl1680: touchscreen@40 {
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compatible = "silead,gsl1680";
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reg = <0x40>;
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interrupt-parent = <&pio>;
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interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>;
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power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
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touchscreen-size-x = <480>;
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touchscreen-size-y = <800>;
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touchscreen-inverted-x;
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touchscreen-swapped-x-y;
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silead,max-fingers = <5>;
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};
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};
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