extcon: max77693: Check the state/type of cable after boot completed

This patch check the state/type of cable after completing the initialization
of platform and notify platform of cable state/type through extcon. If extcon
provider driver notify the state/type of cable before completing platform boot,
this uevent is unused and ignored.

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

1 files changed, 34 insertions, 3 deletions

diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
index 07ea96bfd0cb..10f41f3d5be4 100644
--- a/drivers/extcon/extcon-max77693.c
+++ b/drivers/extcon/extcon-max77693.c
@@ -30,6 +30,7 @@
 #include <linux/irqdomain.h>
 
 #define DEV_NAME                        "max77693-muic"
+#define DELAY_MS_DEFAULT                20000           /* unit: millisecond */
 
 enum max77693_muic_adc_debounce_time {
         ADC_DEBOUNCE_TIME_5MS = 0,
@@ -52,6 +53,14 @@ struct max77693_muic_info {
         struct work_struct irq_work;
         struct mutex mutex;
 
+        /*
+         * Use delayed workqueue to detect cable state and then
+         * notify cable state to notifiee/platform through uevent.
+         * After completing the booting of platform, the extcon provider
+         * driver should notify cable state to upper layer.
+         */
+        struct delayed_work wq_detcable;
+
         /* Button of dock device */
         struct input_dev *dock;
 };
@@ -912,13 +921,23 @@ static int max77693_muic_detect_accessory(struct max77693_muic_info *info)
         return ret;
 }
 
+static void max77693_muic_detect_cable_wq(struct work_struct *work)
+{
+        struct max77693_muic_info *info = container_of(to_delayed_work(work),
+                                struct max77693_muic_info, wq_detcable);
+
+        max77693_muic_detect_accessory(info);
+}
+
 static int max77693_muic_probe(struct platform_device *pdev)
 {
         struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent);
         struct max77693_platform_data *pdata = dev_get_platdata(max77693->dev);
         struct max77693_muic_platform_data *muic_pdata = pdata->muic_data;
         struct max77693_muic_info *info;
-        int ret, i;
+        int delay_jiffies;
+        int ret;
+        int i;
         u8 id;
 
         info = devm_kzalloc(&pdev->dev, sizeof(struct max77693_muic_info),
@@ -1051,8 +1070,20 @@ static int max77693_muic_probe(struct platform_device *pdev)
         /* Set ADC debounce time */
         max77693_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
 
-        /* Detect accessory on boot */
-        max77693_muic_detect_accessory(info);
+        /*
+         * Detect accessory after completing the initialization of platform
+         *
+         * - Use delayed workqueue to detect cable state and then
+         * notify cable state to notifiee/platform through uevent.
+         * After completing the booting of platform, the extcon provider
+         * driver should notify cable state to upper layer.
+         */
+        INIT_DELAYED_WORK(&info->wq_detcable, max77693_muic_detect_cable_wq);
+        if (muic_pdata->detcable_delay_ms)
+                delay_jiffies = msecs_to_jiffies(muic_pdata->detcable_delay_ms);
+        else
+                delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
+        schedule_delayed_work(&info->wq_detcable, delay_jiffies);
 
         return ret;