extcon: sm5502: Detect cable state after completing platform booting

This patch detect whether cable is connected or not and the cable type
after completing kernel/platform booting using system_power_efficient_wq.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/extcon/extcon-sm5502.c b/drivers/extcon/extcon-sm5502.c
index 9f318c222b89..a32d40f97ff0 100644
--- a/drivers/extcon/extcon-sm5502.c
+++ b/drivers/extcon/extcon-sm5502.c
@@ -28,6 +28,8 @@
 #include <linux/extcon.h>
 #include <linux/extcon/sm5502.h>
 
+#define DELAY_MS_DEFAULT                17000   /* unit: millisecond */
+
 struct muic_irq {
         unsigned int irq;
         const char *name;
@@ -59,6 +61,14 @@ struct sm5502_muic_info {
         unsigned int num_reg_data;
 
         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;
 };
 
 /* Default value of SM5502 register to bring up MUIC device. */
@@ -341,6 +351,8 @@ static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
         case SM5502_MUIC_ADC_OPEN_USB_OTG:
                 idx = EXTCON_CABLE_USB_HOST;
                 break;
+        case SM5502_MUIC_ADC_GROUND:
+                break;
         default:
                 dev_dbg(info->dev,
                         "cannot handle this cable_type (0x%x)\n", cable_type);
@@ -433,6 +445,18 @@ static irqreturn_t sm5502_muic_irq_handler(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+static void sm5502_muic_detect_cable_wq(struct work_struct *work)
+{
+        struct sm5502_muic_info *info = container_of(to_delayed_work(work),
+                                struct sm5502_muic_info, wq_detcable);
+        int ret;
+
+        /* Notify the state of connector cable or not  */
+        ret = sm5502_muic_cable_handler(info, true);
+        if (ret < 0)
+                dev_warn(info->dev, "failed to detect cable state\n");
+}
+
 static void sm5502_init_dev_type(struct sm5502_muic_info *info)
 {
         unsigned int reg_data, vendor_id, version_id;
@@ -546,6 +570,18 @@ static int sm5022_muic_i2c_probe(struct i2c_client *i2c,
                 return ret;
         }
 
+        /*
+         * 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, sm5502_muic_detect_cable_wq);
+        queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
+                        msecs_to_jiffies(DELAY_MS_DEFAULT));
+
         /* Initialize SM5502 device and print vendor id and version id */
         sm5502_init_dev_type(info);