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>

diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
index 07ea96b..10f41f3 100644 (file)
--- 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;
 

diff --git a/include/linux/mfd/max77693.h b/include/linux/mfd/max77693.h
index fe03b2d..9aa9c20 100644 (file)
--- a/include/linux/mfd/max77693.h
+++ b/include/linux/mfd/max77693.h
@@ -38,6 +38,8 @@ struct max77693_reg_data {
 struct max77693_muic_platform_data {
        struct max77693_reg_data *init_data;
        int num_init_data;
+
+       int detcable_delay_ms;
 };
 
 struct max77693_platform_data {