ths7303_write
err = ths7303_write(sd, THS7303_CHANNEL_1, val);
err = ths7303_write(sd, THS7303_CHANNEL_2, val);
err = ths7303_write(sd, THS7303_CHANNEL_3, val);
ths7303_write(sd, THS7303_CHANNEL_1,
ths7303_write(sd, THS7303_CHANNEL_2,
ths7303_write(sd, THS7303_CHANNEL_3,
ths7303_write(sd, reg->reg, reg->val);