ASoC: codec: wcd938x: Add switch control for selecting CTIA/OMTP Headset

Add switch control for selecting CTIA or OMTP Headset by swapping
gnd and mic with the help of GPIO.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Co-developed-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
Signed-off-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
Link: https://lore.kernel.org/r/1644668672-29790-2-git-send-email-quic_srivasam@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/wcd938x.c b/sound/soc/codecs/wcd938x.c
index eff200a..08d16a9 100644 (file)
--- a/sound/soc/codecs/wcd938x.c
+++ b/sound/soc/codecs/wcd938x.c
@@ -194,6 +194,7 @@ struct wcd938x_priv {
        int ear_rx_path;
        int variant;
        int reset_gpio;
+       int us_euro_gpio;
        u32 micb1_mv;
        u32 micb2_mv;
        u32 micb3_mv;
@@ -4196,6 +4197,33 @@ static void wcd938x_dt_parse_micbias_info(struct device *dev, struct wcd938x_pri
                dev_info(dev, "%s: Micbias4 DT property not found\n", __func__);
 }
 
+static bool wcd938x_swap_gnd_mic(struct snd_soc_component *component, bool active)
+{
+       int value;
+
+       struct wcd938x_priv *wcd938x;
+
+       if (!component) {
+               dev_err(component->dev, "%s component is NULL\n", __func__);
+               return false;
+       }
+
+       wcd938x = snd_soc_component_get_drvdata(component);
+       if (!wcd938x) {
+               dev_err(component->dev, "%s private data is NULL\n", __func__);
+               return false;
+       }
+
+       value = gpio_get_value(wcd938x->us_euro_gpio);
+
+       gpio_set_value(wcd938x->us_euro_gpio, !value);
+       /* 20us sleep required after changing the gpio state*/
+       usleep_range(20, 30);
+
+       return true;
+}
+
+
 static int wcd938x_populate_dt_data(struct wcd938x_priv *wcd938x, struct device *dev)
 {
        struct wcd_mbhc_config *cfg = &wcd938x->mbhc_cfg;
@@ -4208,6 +4236,16 @@ static int wcd938x_populate_dt_data(struct wcd938x_priv *wcd938x, struct device
                return wcd938x->reset_gpio;
        }
 
+       wcd938x->us_euro_gpio = of_get_named_gpio(dev->of_node, "us-euro-gpios", 0);
+       if (wcd938x->us_euro_gpio < 0) {
+               dev_err(dev, "Failed to get us-euro-gpios gpio: err = %d\n", wcd938x->us_euro_gpio);
+       } else {
+               cfg->swap_gnd_mic = wcd938x_swap_gnd_mic;
+               gpio_direction_output(wcd938x->us_euro_gpio, 0);
+               /* 20us sleep required after pulling the reset gpio to LOW */
+               usleep_range(20, 30);
+       }
+
        wcd938x->supplies[0].supply = "vdd-rxtx";
        wcd938x->supplies[1].supply = "vdd-io";
        wcd938x->supplies[2].supply = "vdd-buck";