projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c77fd0a4 | 1 | Device tree bindings for Microchip CAP11xx based capacitive touch sensors |
| 128bb95d | 2 | |
| c77fd0a4 | 3 | The node for this device must be a child of a I2C controller node, as the |
| 128bb95d DM |
4 | device communication via I2C only. |
| 5 | ||
| 6 | Required properties: | |
| 7 | ||
| c77fd0a4 MR |
8 | compatible: Must contain one of: |
| 9 | "microchip,cap1106" | |
| 7609a5e9 MR |
10 | "microchip,cap1126" |
| 11 | "microchip,cap1188" | |
| 128bb95d DM |
12 | |
| 13 | reg: The I2C slave address of the device. | |
| 128bb95d DM |
14 | |
| 15 | interrupts: Property describing the interrupt line the | |
| 16 | device's ALERT#/CM_IRQ# pin is connected to. | |
| 17 | The device only has one interrupt source. | |
| 18 | ||
| 19 | Optional properties: | |
| 20 | ||
| 21 | autorepeat: Enables the Linux input system's autorepeat | |
| 22 | feature on the input device. | |
| 23 | ||
| 24 | microchip,sensor-gain: Defines the gain of the sensor circuitry. This | |
| 25 | effectively controls the sensitivity, as a | |
| 26 | smaller delta capacitance is required to | |
| 27 | generate the same delta count values. | |
| 28 | Valid values are 1, 2, 4, and 8. | |
| 29 | By default, a gain of 1 is set. | |
| 30 | ||
| 6bdd2fd1 MR |
31 | microchip,irq-active-high: By default the interrupt pin is active low |
| 32 | open drain. This property allows using the active | |
| 33 | high push-pull output. | |
| 34 | ||
| 128bb95d DM |
35 | linux,keycodes: Specifies an array of numeric keycode values to |
| 36 | be used for the channels. If this property is | |
| 37 | omitted, KEY_A, KEY_B, etc are used as | |
| 38 | defaults. The array must have exactly six | |
| 39 | entries. | |
| 40 | ||
| 41 | Example: | |
| 42 | ||
| 43 | i2c_controller { | |
| 44 | cap1106@28 { | |
| 45 | compatible = "microchip,cap1106"; | |
| 46 | interrupt-parent = <&gpio1>; | |
| 47 | interrupts = <0 0>; | |
| 48 | reg = <0x28>; | |
| 49 | autorepeat; | |
| 50 | microchip,sensor-gain = <2>; | |
| 51 | ||
| c77fd0a4 MR |
52 | linux,keycodes = <103>, /* KEY_UP */ |
| 53 | <106>, /* KEY_RIGHT */ | |
| 54 | <108>, /* KEY_DOWN */ | |
| 55 | <105>, /* KEY_LEFT */ | |
| 56 | <109>, /* KEY_PAGEDOWN */ | |
| 57 | <104>; /* KEY_PAGEUP */ | |
| efe3b616 MR |
58 | |
| 59 | #address-cells = <1>; | |
| 60 | #size-cells = <0>; | |
| 61 | ||
| 62 | usr@0 { | |
| 63 | label = "cap11xx:green:usr0"; | |
| 64 | reg = <0>; | |
| 65 | }; | |
| 66 | ||
| 67 | usr@1 { | |
| 68 | label = "cap11xx:green:usr1"; | |
| 69 | reg = <1>; | |
| 70 | }; | |
| 71 | ||
| 72 | alive@2 { | |
| 73 | label = "cap11xx:green:alive"; | |
| 74 | reg = <2>; | |
| 75 | linux,default_trigger = "heartbeat"; | |
| 76 | }; | |
| 128bb95d DM |
77 | }; |
| 78 | } |