ASoC: Support GPIO based microphone detection for WM8904

The WM8904 allows microphone detection signals to be brought out as
alternate functions of the GPIO signals which can be detected using
interrupt inputs on the CPU. Allow this to be configured using
platform data.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 5 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8904.c b/sound/soc/codecs/wm8904.c
index ce3f004217ae..c5b50d73f2d5 100644
--- a/sound/soc/codecs/wm8904.c
+++ b/sound/soc/codecs/wm8904.c
@@ -2540,6 +2540,11 @@ static int wm8904_register(struct wm8904_priv *wm8904,
                         wm8904->reg_cache[WM8904_GPIO_CONTROL_1 + i]
                                 = pdata->gpio_cfg[i] & 0xffff;
                 }
+
+                /* Zero is the default value for these anyway */
+                for (i = 0; i < WM8904_MIC_REGS; i++)
+                        wm8904->reg_cache[WM8904_MIC_BIAS_CONTROL_0 + i]
+                                = pdata->mic_cfg[i];
         }
 
         /* Set Class W by default - this will be managed by the Class