struct input_dev *input; input = devm_input_allocate_device(&hdev->dev); input_set_abs_params(input, ABS_MT_POSITION_X, 0, 4095, 0, 0); input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 4095, 0, 0); input_set_abs_params(input, ABS_MT_TRACKING_ID, 0, 255, 0, 0);
static int tp_suspend(struct hid_device *hdev, pm_message_t message) hid compliant touchpad driver
Touchpad Sensor → Microcontroller (Firmware) → USB/I2C → HID Driver → Input Subsystem → User Apps A valid HID descriptor defines the format of input reports. Below is a minimal multi-touch touchpad descriptor (simplified for clarity): struct input_dev *input
| OS | Latency (ms) | Max touches | Gestures supported | Quirks | |----|--------------|-------------|--------------------|--------| | Linux 6.1 | 6.2 | 5 | 2-finger scroll, pinch | None | | Windows 11 | 8.5 | 5 | 3-finger swipe | Requires .inf | | macOS 13 | 12.0 | 5 | Only basic | Needs IOKit wrapper | input = devm_input_allocate_device(&hdev->
static int tp_raw_event(struct hid_device *hdev, struct hid_report *report, u8 *data, int size)
