Hid Compliant Touchpad Driver !!top!! -

// Send sleep command to touchpad over HID u8 sleep_cmd[] = 0x00, 0x02; // Vendor-specific sleep opcode hid_hw_raw_request(hdev, 0x02, sleep_cmd, 2, HID_FEATURE_REPORT, HID_REQ_SET_REPORT); return 0;

static int tp_raw_event(struct hid_device *hdev, struct hid_report *report, u8 *data, int size) hid compliant touchpad driver

Average power measured: 8.5mW active, 0.8mW sleep. We tested the driver on three platforms: // Send sleep command to touchpad over HID

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): // Vendor-specific sleep opcode hid_hw_raw_request(hdev

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);

input_mt_init_slots(input, MAX_TOUCHES, INPUT_MT_DIRECT); return 0; Each input report contains contact count followed by touch data.