SDSI_SIZE_READ_MSG
info.buffer = kmalloc(SDSI_SIZE_READ_MSG, GFP_KERNEL);
static const BIN_ATTR_ADMIN_RO(state_certificate, SDSI_SIZE_READ_MSG);
static const BIN_ATTR_ADMIN_RO(meter_certificate, SDSI_SIZE_READ_MSG);
static const BIN_ATTR_ADMIN_RO(meter_current, SDSI_SIZE_READ_MSG);