[alsa-devel] [PATCH] ASoC: nau8825: jack connection decision with different insertion logic

[Anatol Pomozov]

Hi

On Tue, Jun 28, 2016 at 8:20 PM, John Hsu <KCHSU0 at nuvoton.com> wrote:
> The original design only covers the jack insertion logic is active low.
> Add more condition to cover no matter the logic is active low and high.
>
> Signed-off-by: John Hsu <KCHSU0 at nuvoton.com>
> ---
>  sound/soc/codecs/nau8825.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
> index 3f30e6e..a2f0d03 100644
> --- a/sound/soc/codecs/nau8825.c
> +++ b/sound/soc/codecs/nau8825.c
> @@ -1345,10 +1345,18 @@ EXPORT_SYMBOL_GPL(nau8825_enable_jack_detect);
>
>  static bool nau8825_is_jack_inserted(struct regmap *regmap)
>  {
> -       int status;
> +       int status, jkdet, res;
>
>         regmap_read(regmap, NAU8825_REG_I2C_DEVICE_ID, &status);
> -       return !(status & NAU8825_GPIO2JD1);
> +       regmap_read(regmap, NAU8825_REG_JACK_DET_CTRL, &jkdet);
> +
> +       /* return jack connection status according to jack insertion logic
> +        * active high or active low.
> +        */
> +       res = !(status & NAU8825_GPIO2JD1) * !(jkdet & NAU8825_JACK_POLARITY) +
> +               (status & NAU8825_GPIO2JD1) * (jkdet & NAU8825_JACK_POLARITY);

It makes more sense to use a more boolean-like expression. Something like

      return !!(status & NAU8825_GPIO2JD1) == !!(jkdet & NAU8825_JACK_POLARITY);
(hope I translated expression above correctly)

or even better to introduce readable bool flags:
      bool active_high = !!(jkdet & NAU8825_JACK_POLARITY);
      bool is_high = !!(status & NAU8825_GPIO2JD1);
      return active_high == is_high;



> +
> +       return res ? true : false;
>  }
>
>  static void nau8825_restart_jack_detection(struct regmap *regmap)
> --
> 2.6.4
>