mgb4_i2c_read_byte
version = mgb4_i2c_read_byte(&extender, 0x00);
ret = mgb4_i2c_read_byte(client, reg);
s32 mgb4_i2c_read_byte(struct mgb4_i2c_client *client, u16 reg);
ret = mgb4_i2c_read_byte(&vindev->deser, 0x34);
ret = mgb4_i2c_read_byte(&vindev->deser, i2c_reg);
r1 = mgb4_i2c_read_byte(&vindev->deser, 0x01);
r300 = mgb4_i2c_read_byte(&vindev->deser, 0x300);
r3 = mgb4_i2c_read_byte(&vindev->deser, 0x03);
ret = mgb4_i2c_read_byte(&vindev->deser, 0xA0);
r3e0 = mgb4_i2c_read_byte(&vindev->deser, 0x3E0);
r308 = mgb4_i2c_read_byte(&vindev->deser, 0x308);
ret = mgb4_i2c_read_byte(&voutdev->ser, 0x5B);