BCM63138_LED_BITS
int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;
#define BCM63138_LED_MASK ((1 << BCM63138_LED_BITS) - 1) /* 0xf */
#define BCM63138_LEDS_PER_REG (32 / BCM63138_LED_BITS) /* 8 */
int shift = (led->pin & (BCM63138_LEDS_PER_REG - 1)) * BCM63138_LED_BITS;