From 0d214d66bf26609303f946b1f1b6aff7fa1d9d86 Mon Sep 17 00:00:00 2001
From: Dongwoo Lee <dwoo08.lee@samsung.com>
Date: Tue, 18 Feb 2020 13:36:40 +0900
Subject: [PATCH] usb: dwc2: gadget: Set extcon state for usb cable as always
 true

To inform to userspace as enable usb features always, set extcon
state for usb cable as connected permanently. To enable this, add
"g-extcon-always-on" property on dt.

Change-Id: I5bcc1b7560278dab8bde6fc80549bc145179574c
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>
---
 drivers/usb/dwc2/core.h   |  3 +++
 drivers/usb/dwc2/gadget.c | 20 ++++++++++++++++++++
 drivers/usb/dwc2/params.c |  6 +++++-
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index cc9c93a..32d2be1 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -487,6 +487,9 @@ struct dwc2_core_params {
 	u32 g_rx_fifo_size;
 	u32 g_np_tx_fifo_size;
 	u32 g_tx_fifo_size[MAX_EPS_CHANNELS];
+#if IS_ENABLED(CONFIG_EXTCON)
+	bool g_extcon_always_on;
+#endif
 
 	bool change_speed_quirk;
 };
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index d842483..aa5d7de 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -23,6 +23,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/of_platform.h>
+#include <linux/extcon-provider.h>
 
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
@@ -4767,6 +4768,25 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg)
 	}
 	dwc2_hsotg_dump(hsotg);
 
+#if IS_ENABLED(CONFIG_EXTCON)
+	if (hsotg->params.g_extcon_always_on) {
+		struct extcon_dev *edev;
+		static const unsigned int supported_cable[] = {
+			EXTCON_USB,
+			EXTCON_NONE,
+		};
+
+		edev = devm_extcon_dev_allocate(dev, supported_cable);
+		if (IS_ERR(edev))
+			return PTR_ERR(edev);
+
+		ret = devm_extcon_dev_register(dev, edev);
+		if (ret)
+			return ret;
+
+		extcon_set_state_sync(edev, EXTCON_USB, true);
+	}
+#endif
 	return 0;
 }
 
diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index a93415f..d674a48 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -369,7 +369,11 @@ static void dwc2_get_device_properties(struct dwc2_hsotg *hsotg)
 		num = device_property_read_u32_array(hsotg->dev,
 						     "g-tx-fifo-size",
 						     NULL, 0);
-
+#if IS_ENABLED(CONFIG_EXTCON)
+		if (of_find_property(hsotg->dev->of_node,
+					"g-extcon-always-on", NULL))
+			p->g_extcon_always_on = 1;
+#endif
 		if (num > 0) {
 			num = min(num, 15);
 			memset(p->g_tx_fifo_size, 0,
-- 
2.7.4