I was finally able to get my driver working. I had to use the copy callback since my memory is external to Alsa. I have noticed that I commented out the silence callback and the ack. All seems to work and just for grins, I put them in with some printk's and they were never invoked. I don't fully understand these callbacks. When are they called and am I just lucky?

Bruce

--------------------- Bruce Barclay Intel Corporation ( Phone : 480-554-0553 ( Cell : 480-274-7493 * Email:bruce.barclay@intel.com * MS : CH7-308 "Real Gold Fears No Fire" - Li Quan