On Tue, Apr 22, 2008 at 8:07 AM, Harsha priya gupta harshapriya@gmail.com wrote:

I am not using the mmap method. How can i make sure that everytime a user buffer is passed to driver, my copy function would be called?

On Mon, Apr 21, 2008 at 9:30 PM, Takashi Iwai tiwai@suse.de wrote:

...

At Mon, 21 Apr 2008 19:27:45 +0530, Harsha priya gupta wrote:

...

Hi, I am trying to implement the .copy function of playack_ops in my

driver. But

...

when I try playing an mp3 file, my .copy's function code path was

executing.

...

Suddenly I do not see that function being called. Can anyone help me understand when the following code path will be executed

snd_pcm_lib_write_transfer substream->ops->copy

Do you use a mmap method? If so, the copy callback won't be called. The copy callback is only for copying the data from the user-space buffer to the driver buffer, which is skipped via mmap.

Takashi

-- -Harsha