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From 8595748e58885439c7e18a11a94702378bff3b02 Mon Sep 17 00:00:00 2001
From: Li Jun <jun.li@nxp.com>
Date: Sun, 27 Jan 2019 19:40:03 +0800
Subject: [PATCH] usb: dwc3: drd: add usb role switch class support for dual
role swap
Register a usb_role_switch for dual role swap if the property
"usb-role-switch" is present.
Signed-off-by: Li Jun <jun.li@nxp.com>
---
drivers/usb/dwc3/core.h | 2 ++
drivers/usb/dwc3/drd.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 48 insertions(+), 1 deletion(-)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -25,6 +25,7 @@
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
+#include <linux/usb/role.h>
#include <linux/ulpi/interface.h>
#include <linux/phy/phy.h>
@@ -1096,6 +1097,7 @@ struct dwc3 {
void __iomem *regs;
size_t regs_size;
+ struct usb_role_switch *role_switch;
enum usb_dr_mode dr_mode;
u32 current_dr_role;
u32 desired_dr_role;
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -476,6 +476,43 @@ static struct extcon_dev *dwc3_get_extco
return edev;
}
+static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
+{
+ u32 mode;
+
+ switch (role) {
+ case USB_ROLE_HOST:
+ mode = DWC3_GCTL_PRTCAP_HOST;
+ break;
+ case USB_ROLE_DEVICE:
+ mode = DWC3_GCTL_PRTCAP_DEVICE;
+ break;
+ default:
+ return 0;
+ };
+
+ dwc3_set_mode(dev_get_drvdata(dev), mode);
+ return 0;
+}
+
+static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
+{
+ struct dwc3 *dwc = dev_get_drvdata(dev);
+ unsigned long flags;
+ enum usb_role role;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+ role = dwc->current_dr_role;
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ return role;
+}
+
+static const struct usb_role_switch_desc dwc3_role_switch = {
+ .set = dwc3_usb_role_switch_set,
+ .get = dwc3_usb_role_switch_get,
+};
+
int dwc3_drd_init(struct dwc3 *dwc)
{
int ret, irq;
@@ -484,7 +521,12 @@ int dwc3_drd_init(struct dwc3 *dwc)
if (IS_ERR(dwc->edev))
return PTR_ERR(dwc->edev);
- if (dwc->edev) {
+ if (device_property_read_bool(dwc->dev, "usb-role-switch")) {
+ dwc->role_switch = usb_role_switch_register(dwc->dev,
+ &dwc3_role_switch);
+ if (IS_ERR(dwc->role_switch))
+ return PTR_ERR(dwc->role_switch);
+ } else if (dwc->edev) {
dwc->edev_nb.notifier_call = dwc3_drd_notifier;
ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
&dwc->edev_nb);
@@ -531,6 +573,9 @@ void dwc3_drd_exit(struct dwc3 *dwc)
{
unsigned long flags;
+ if (dwc->role_switch)
+ usb_role_switch_unregister(dwc->role_switch);
+
if (dwc->edev)
extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
&dwc->edev_nb);
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