extcon: max8997: Set default of ADC debounce time during initialization

This patch set default of ADC Debounce Time(25ms) during probe step.
Also, can possible change ADC Debounce Time according to H/W situation
by using max8997_set_adc_debounce_time()

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-max8997.c b/drivers/extcon/extcon-max8997.c
index 8739b50c2b36..3206daaf8e08 100644
--- a/drivers/extcon/extcon-max8997.c
+++ b/drivers/extcon/extcon-max8997.c
@@ -30,6 +30,13 @@
 
 #define DEV_NAME                        "max8997-muic"
 
+enum max8997_muic_adc_debounce_time {
+        ADC_DEBOUNCE_TIME_0_5MS = 0,    /* 0.5ms */
+        ADC_DEBOUNCE_TIME_10MS,         /* 10ms */
+        ADC_DEBOUNCE_TIME_25MS,         /* 25ms */
+        ADC_DEBOUNCE_TIME_38_62MS,      /* 38.62ms */
+};
+
 struct max8997_muic_irq {
         unsigned int irq;
         const char *name;
@@ -95,6 +102,38 @@ static const char *max8997_extcon_cable[] = {
 };
 
 /*
+ * max8997_muic_set_debounce_time - Set the debounce time of ADC
+ * @info: the instance including private data of max8997 MUIC
+ * @time: the debounce time of ADC
+ */
+static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
+                enum max8997_muic_adc_debounce_time time)
+{
+        int ret;
+
+        switch (time) {
+        case ADC_DEBOUNCE_TIME_0_5MS:
+        case ADC_DEBOUNCE_TIME_10MS:
+        case ADC_DEBOUNCE_TIME_25MS:
+        case ADC_DEBOUNCE_TIME_38_62MS:
+                ret = max8997_update_reg(info->muic,
+                                          MAX8997_MUIC_REG_CONTROL3,
+                                          time << CONTROL3_ADCDBSET_SHIFT,
+                                          CONTROL3_ADCDBSET_MASK);
+                if (ret) {
+                        dev_err(info->dev, "failed to set ADC debounce time\n");
+                        return -EAGAIN;
+                }
+                break;
+        default:
+                dev_err(info->dev, "invalid ADC debounce time\n");
+                return -EINVAL;
+        }
+
+        return 0;
+};
+
+/*
  * max8997_muic_set_path - Set hardware line according to attached cable
  * @info: the instance including private data of max8997 MUIC
  * @value: the path according to attached cable
@@ -507,6 +546,9 @@ static int max8997_muic_probe(struct platform_device *pdev)
                 }
         }
 
+        /* Set ADC debounce time */
+        max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
+
         /* Initial device detection */
         max8997_muic_detect_dev(info);