linux-kernel - [PATCH 1/2] dt-bindings: input: microchip,cap11xx: add advanced sensitivity settings

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Date:   Sat, 15 Apr 2023 01:38:14 +0200
From:   Jiri Valek - 2N <jiriv@...s.com>
To:     <dmitry.torokhov@...il.com>, <krzysztof.kozlowski+dt@...aro.org>
CC:     <jiriv@...s.com>, <devicetree@...r.kernel.org>,
        <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <robh+dt@...nel.org>, <u.kleine-koenig@...gutronix.de>
Subject: [PATCH 1/2] dt-bindings: input: microchip,cap11xx: add advanced sensitivity settings

Add support for advanced sensitivity settings and signal guard feature.

Signed-off-by: Jiri Valek - 2N <jiriv@...s.com>
---
 .../bindings/input/microchip,cap11xx.yaml     | 64 ++++++++++++++++++-
 1 file changed, 61 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml b/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
index 5fa625b5c5fb..08e28226a164 100644
--- a/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
+++ b/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
@@ -45,13 +45,13 @@ properties:
       Enables the Linux input system's autorepeat feature on the input device.
 
   linux,keycodes:
-    minItems: 6
-    maxItems: 6
+    minItems: 3
+    maxItems: 8
     description: |
       Specifies an array of numeric keycode values to
       be used for the channels. If this property is
       omitted, KEY_A, KEY_B, etc are used as defaults.
-      The array must have exactly six entries.
+      The number of entries must correspond to the number of channels.
 
   microchip,sensor-gain:
     $ref: /schemas/types.yaml#/definitions/uint32
@@ -70,6 +70,58 @@ properties:
       open drain. This property allows using the active
       high push-pull output.
 
+  microchip,sensitivity-delta-sense:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 32
+    enum: [1, 2, 4, 8, 16, 32, 64, 128]
+    description: |
+      Optional parameter. Controls the sensitivity multiplier of a touch detection.
+      At the more sensitive settings, touches are detected for a smaller delta
+      capacitance corresponding to a “lighter” touch.
+
+  microchip,sensitivity-base-shift:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 256
+    enum: [1, 2, 4, 8, 16, 32, 64, 128, 256]
+    description: |
+      Optional parameter. Controls data scaling factor.
+      The higher the value of these bits, the larger the range and the lower
+      the resolution of the data presented. These settings will not affect
+      touch detection or sensitivity.
+
+  microchip,signal-guard:
+    minItems: 3
+    maxItems: 8
+    enum: [0, 1]
+    default: 0
+    description: |
+      Optional parameter supported only for CAP129x.
+      The signal guard isolates the signal from virtual grounds.
+      If enabled then the behavior of the channel is changed to signal guard.
+      The number of entries must correspond to the number of channels.
+
+  microchip,input-treshold:
+    minItems: 3
+    maxItems: 8
+    minimum: 0
+    maximum: 127
+    default: 64
+    description: |
+      Optional parameter. Specifies the delta threshold that is used to
+      determine if a touch has been detected.
+      The number of entries must correspond to the number of channels.
+
+  microchip,calib-sensitivity:
+    minItems: 3
+    maxItems: 8
+    enum: [1, 2, 4]
+    default: 1
+    description: |
+      Optional parameter supported only for CAP129x. Specifies an array of
+      numeric values that controls the gain used by the calibration routine to
+      enable sensor inputs to be more sensitive for proximity detection.
+      The number of entries must correspond to the number of channels.
+
 patternProperties:
   "^led@[0-7]$":
     type: object
@@ -122,6 +174,12 @@ examples:
         reg = <0x28>;
         autorepeat;
         microchip,sensor-gain = <2>;
+        microchip,sensitivity-delta-sense = <16>;
+        microchip,sensitivity-base-shift = <128>;
+
+        microchip,signal-guard = <0>, <0>, <0>, <0>, <0>, <0>;
+        microchip,input-treshold = <21>, <18>, <46>, <46>, <46>, <21>;
+        microchip,calib-sensitivityj = <1>, <2>, <2>, <1>, <1>, <2>;
 
         linux,keycodes = <103>,	/* KEY_UP */
                          <106>,	/* KEY_RIGHT */
-- 
2.25.1