ps2_dev_sliced_command
status_t ps2_dev_sliced_command(ps2_dev *dev, uint8 cmd);
if (ps2_dev_sliced_command(dev, ELANTECH_CMD_REGISTER_WRITE) != B_OK
|| ps2_dev_sliced_command(dev, reg) != B_OK
|| ps2_dev_sliced_command(dev, value) != B_OK
if (ps2_dev_sliced_command(dev, ELANTECH_CMD_REGISTER_READ) != B_OK
|| ps2_dev_sliced_command(dev, reg) != B_OK
if (ps2_dev_sliced_command(dev, cmd) != B_OK