LEDS_TO_BYTES
LEDS_TO_BYTES(length), DMA_MEM_TO_DEV, 0);
priv->buffer = devm_kzalloc(dev, LEDS_TO_BYTES(LEDC_MAX_LEDS), GFP_KERNEL);
LEDS_TO_BYTES(LEDC_MAX_LEDS), &priv->dma_handle,