msp_read_dem
val = msp_read_dem(client, reg);
int msp_read_dem(struct i2c_client *client, int addr);
val = msp_read_dem(client, 0x7e);
int status = msp_read_dem(client, 0x0200);
val = msp_read_dem(client, 0x23);
val = msp_read_dem(client, 0x7e);