SR_PRIV int gl_reg_write(libusb_device_handle *devh, unsigned int reg,
unsigned int val);
SR_PRIV int gl_reg_read(libusb_device_handle *devh, unsigned int reg);
SR_PRIV int gl_reg_write(libusb_device_handle *devh, unsigned int reg,
unsigned int val);
SR_PRIV int gl_reg_read(libusb_device_handle *devh, unsigned int reg);