On Fri, Oct 30, 2020 at 3:57 PM Ajye Huang [off-list ref] wrote:

+static struct gpio_desc *dmic_sel;
+static int dmic_switch;

If you really need them, you should put them in struct sc7180_snd_data.

+static int dmic_set(struct snd_kcontrol *kcontrol,
+                   struct snd_ctl_elem_value *ucontrol)
+{
+       if (dmic_sel) {

if (IS_ERR(dmic_sel))
But I think you don't need to check dmic_sel.  Suppose your _probe()
already returned error, the code here shouldn't be called.

+               dmic_switch = ucontrol->value.integer.value[0];

Looks like it can be a local variable.  You don't need to save dmic_switch.

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