lp3943            111 include/linux/mfd/lp3943.h int lp3943_read_byte(struct lp3943 *lp3943, u8 reg, u8 *read);
lp3943            112 include/linux/mfd/lp3943.h int lp3943_write_byte(struct lp3943 *lp3943, u8 reg, u8 data);
lp3943            113 include/linux/mfd/lp3943.h int lp3943_update_bits(struct lp3943 *lp3943, u8 reg, u8 mask, u8 data);