lp8727_write_byte
ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
return lp8727_write_byte(pchg, LP8727_CTRL2, val);
lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
lp8727_write_byte(pchg, LP8727_CTRL2, val);
lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);