PCIIDE_CHANNEL_NDEV
compatchan = *unit / PCIIDE_CHANNEL_NDEV;
*unit %= PCIIDE_CHANNEL_NDEV;
#define NUNITS (PCIIDE_CHANNEL_NDEV * PCIIDE_NUM_CHANNELS)
#define NUNITS (PCIIDE_CHANNEL_NDEV * PCIIDE_NUM_CHANNELS)