usb: dwc3: debugfs: dual role switch through debugfs entries

dual role switch through debugfs entries
usage:
1) mount debugfs
	# mount -t debugfs debugfs /mnt

2) To switch usb1 to device/host mode
	# echo "device" > /mnt/48890000.dwc3/mode
        # echo "host" > /mnt/48890000.dwc3/mode

3) To switch usb2 to device/host mode
        # echo "device" > /mnt/488d0000.dwc3/mode
        # echo "host" > /mnt/488d0000.dwc3/mode

To switch to device mode: make sure previous mode is host.
To switch to host mode: make sure previous mode is device

Change-Id: Ie7f637df45b215b966e9eb17637907a74278aa7e
Signed-off-by: Ravi Babu <ravibabu@ti.com>

3 files changed, 42 insertions, 8 deletions

diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
index 9ac37fe1b6a..0cc5a015451 100644
--- a/drivers/usb/dwc3/debugfs.c
+++ b/drivers/usb/dwc3/debugfs.c
@@ -27,6 +27,7 @@
 #include <linux/uaccess.h>
 
 #include <linux/usb/ch9.h>
+#include <linux/usb/drd.h>
 
 #include "core.h"
 #include "gadget.h"
@@ -412,7 +413,15 @@ static ssize_t dwc3_mode_write(struct file *file,
 
 	if (mode) {
 		spin_lock_irqsave(&dwc->lock, flags);
-		dwc3_set_mode(dwc, mode);
+		if (mode & DWC3_GCTL_PRTCAP_HOST) {
+			dwc3_omap_usbvbus_id_handler(dwc->dev->parent,
+				OMAP_DWC3_ID_GROUND);
+			mode = 0;
+		} else if (mode & DWC3_GCTL_PRTCAP_DEVICE) {
+			dwc3_omap_usbvbus_id_handler(dwc->dev->parent,
+				OMAP_DWC3_VBUS_VALID);
+			mode = 1;
+		}
 		spin_unlock_irqrestore(&dwc->lock, flags);
 	}
 	return count;
diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index 4ccdef7333c..96b4c46cbbd 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -32,6 +32,7 @@
 #include <linux/regulator/consumer.h>
 
 #include <linux/usb/otg.h>
+#include <linux/usb/drd.h>
 
 /*
  * All these registers belong to OMAP's Wrapper around the
@@ -137,13 +138,6 @@ struct dwc3_omap {
 	struct regulator	*vbus_reg;
 };
 
-enum omap_dwc3_vbus_id_status {
-	OMAP_DWC3_ID_FLOAT,
-	OMAP_DWC3_ID_GROUND,
-	OMAP_DWC3_VBUS_OFF,
-	OMAP_DWC3_VBUS_VALID,
-};
-
 static inline u32 dwc3_omap_readl(void __iomem *base, u32 offset)
 {
 	return readl(base + offset);
@@ -278,6 +272,28 @@ static void dwc3_omap_set_mailbox(struct dwc3_omap *omap,
 	}
 }
 
+int dwc3_omap_usbvbus_id_handler(struct device *dev,
+	enum omap_dwc3_vbus_id_status status)
+{
+	struct dwc3_omap	*omap;
+	struct platform_device	*pdev;
+
+	if (!dev)
+		return -ENODEV;
+
+	dev_dbg(omap->dev, "VBUS Connect\n");
+
+	pdev = to_platform_device(dev);
+	omap =  platform_get_drvdata(pdev);
+	if (!omap)
+		return -ENODEV;
+
+	dwc3_omap_set_mailbox(omap, status);
+
+	return 0;
+}
+EXPORT_SYMBOL(dwc3_omap_usbvbus_id_handler);
+
 static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
 {
 	struct dwc3_omap	*omap = _omap;
diff --git a/include/linux/usb/drd.h b/include/linux/usb/drd.h
index 71c64dcd93e..6a9c3ce5635 100644
--- a/include/linux/usb/drd.h
+++ b/include/linux/usb/drd.h
@@ -22,6 +22,13 @@ struct usb_drd_gadget {
 	struct usb_drd_setup *gadget_setup;
 };
 
+enum omap_dwc3_vbus_id_status {
+	OMAP_DWC3_ID_FLOAT,
+	OMAP_DWC3_ID_GROUND,
+	OMAP_DWC3_VBUS_OFF,
+	OMAP_DWC3_VBUS_VALID,
+};
+
 #define DRD_UNREGISTERED	0x0
 #define DRD_DEVICE_REGISTERED	0x1
 #define DRD_HOST_REGISTERED	0x2
@@ -45,6 +52,8 @@ int usb_drd_stop_hcd(struct device *parent);
 int usb_drd_start_udc(struct device *parent);
 int usb_drd_stop_udc(struct device *parent);
 int usb_drd_get_state(struct device *parent);
+int dwc3_omap_usbvbus_id_handler(struct device *dev,
+	enum omap_dwc3_vbus_id_status status);
 #else
 static inline int usb_drd_release(struct device *parent)
 { return 0; }