[alsa-devel] [PATCH v3] ASoC: Add support for NAU8825 codec to ASoC

[Anatol Pomozov]

Hi

On Sun, Jul 26, 2015 at 11:25 PM, Chih-Chiang Chang
<ccchang12 at nuvoton.com> wrote:
> Hi Anatol,
>
> Thanks for your suggestion. We are working on different architectures to
> support NAU8825 ALSA driver, and I also think it is better we can have a
> cooperation for driver development and upstream. We have checked your
> code, and we think your implement version should more follow the ALSA
> upstream coding standards.

>
> We have another version of ALSA driver, which also supports most
> features as you listed. And I think you already got it from our HW
> engineers. The major difference between our architectures should be the
> flow and sequence in sleep mode, and some other architecture dependence
> codes.

The driver does not have suspend/resume support yet. It would be great
to add it in the future.

> For the upstream, we think it is better to have only one version source
> and could support different architectures. Do you agree to use your
> version to go on the upstream in future?

Yes, it would be great. I will post my code upstream shortly.

Please let me know if you have any suggestions for the driver code.

> If yes, we can port your driver
> to our test platform, and then give the feedback to you.

>
> On 2015/7/23 上午 01:57, Anatol Pomozov wrote:
>> Hi Chih-Chiang
>>
>> On Mon, Jul 13, 2015 at 12:33 AM, Chih-Chiang Chang
>> <ccchang12 at nuvoton.com> wrote:
>>> The NAU88L25 is an ultra-low power high performance audio codec designed
>>> for smartphone, tablet PC, and other portable devices by Nuvoton, now
>>> add linux driver support for it.
>>
>> At ChromeOS we work with Nuvoton hw engineers on driver for this nice
>> chip as well.
>>
>> Here is current driver code
>> https://github.com/anatol/linux/blob/nau8825/sound/soc/codecs/nau8825.c
>>
>> The functionality is mostly ready. Our driver handles playback,
>> capture, mic jack detection, an button presses (4 buttons according
>> Android specification). We need to resolve a few remaining issues,
>> such as
>>  - chip needs better way to recognize high-impedance input (e.g. Bose
>> Quiet Comfort 15 headset)
>>  - implement headset cross talk automatic configuration
>>  - general code cleanup
>>
>> But otherwise driver is functional and used for testing in our next
>> generation device.
>>
>>
>> What do you think about joining efforts on this software development
>> to make great driver for this chip?
>>
>>> Signed-off-by: Chih-Chiang Chang <ccchang12 at nuvoton.com>
>>> ---
>>> v3->v2:
>>>    - fix the wrong definition of reg_default
>>>    - fix the flow of set_sys_clk() and nau8825_set_bias_level()
>>>    - remove unnecessary code in nau8825_volatile_register() and
>>> nau8825_i2c_probe()
>>>    - add trigger function for ADC/DAC control
>>>    - add some register definitions
>>>    - fix some coding style issues
>>> v2->v1:
>>>    - fixes according to Lars-Peter Clausen's review comments
>>>    - removes unused platform data file
>>>    - corrects the naming of DAPM input widget
>>>    - fixes some wrong coding of SOC widgets and other codes
>>>    - adds definition and remark for config FLL clock
>>>    - moves the code of reset hardware registers from codec_probe() to
>>> i2c_probe()
>>>    - removes unused codes
>>>
>>>  sound/soc/codecs/Kconfig   |   5 +
>>>  sound/soc/codecs/Makefile  |   2 +
>>>  sound/soc/codecs/nau8825.c | 724
>>> +++++++++++++++++++++++++++++++++++++++++++++
>>>  sound/soc/codecs/nau8825.h | 399 +++++++++++++++++++++++++
>>>  4 files changed, 1130 insertions(+)
>>>  create mode 100644 sound/soc/codecs/nau8825.c
>>>  create mode 100644 sound/soc/codecs/nau8825.h