[alsa-devel] ASoC legacy i2c client driver probing issue

rajeev rajeev-dlh.kumar at st.com
Wed May 4 06:55:41 CEST 2011

Hi Freg

On 5/2/2011 11:48 PM, Feng Ye wrote:
> Hello,
> I have a legacy i2c client driver probing issue.
> I use kernel version 2.6.27, and wm8750 external codec. The wm8750.c in sound/soc/codecs has a legacy i2c interface (e.g. use attach_adapter() callback). The callback just calls to i2c_probe(). Inside i2c_probe() it checks if the i2c address already been used, and fails there.
> In our i2c bus driver, we used i2c_register_board_info() with a static i2c_board_info structure. And then i2c_add_numbered_adapter() is called.

>>From code trace, it eventually calls i2c_attach_client(). So I think the probe function will for sure to fail.
How does these two related ? You are calling  i2c_attach_client() then why your probe function will fail.
In fact it will never called. 

> I wonder how this would work? How can i2c_probe() succeed if it checks for address in use?
If it is not called then how can you decide whether it succeeded or not?

> This question is more related to i2c instead of alsa soc. I am sure the SoC part is good, the i2c address is passed to wm8750 through snd_soc_codec_device.
> Thanks,
> Feng
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