[PATCH 1/3] usb: common: Add usb_get_dr_mode_from_string and usb_dr_mode_to_string.

[Pawel Laszczak <pawell@cadence.com>]

Patch introduces new function usb_dr_mode_to_string for converting dual
role mod to string and removes static from usb_dr_mode_to_string
definition.

Both changes have made to avoid duplication of code by cdns3 driver.

Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
 drivers/usb/common/common.c | 12 +++++++++++-
 include/linux/usb/otg.h     | 16 ++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 18f5dcf58b0d..a485071325b3 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -118,13 +118,14 @@ static const char *const usb_dr_modes[] = {
 	[USB_DR_MODE_OTG]		= "otg",
 };
 
-static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
+enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
 {
 	int ret;
 
 	ret = match_string(usb_dr_modes, ARRAY_SIZE(usb_dr_modes), str);
 	return (ret < 0) ? USB_DR_MODE_UNKNOWN : ret;
 }
+EXPORT_SYMBOL_GPL(usb_get_dr_mode_from_string);
 
 enum usb_dr_mode usb_get_dr_mode(struct device *dev)
 {
@@ -139,6 +140,15 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(usb_get_dr_mode);
 
+const char *usb_dr_mode_to_string(const enum usb_dr_mode dr_mode)
+{
+	if (dr_mode > USB_DR_MODE_UNKNOWN || dr_mode <= USB_DR_MODE_PERIPHERAL)
+		return usb_dr_modes[dr_mode];
+
+	return usb_dr_modes[USB_DR_MODE_UNKNOWN];
+}
+EXPORT_SYMBOL_GPL(usb_dr_mode_to_string);
+
 #ifdef CONFIG_OF
 /**
  * of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 69f1b6328532..c156817672c4 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -129,4 +129,20 @@ enum usb_dr_mode {
  */
 extern enum usb_dr_mode usb_get_dr_mode(struct device *dev);
 
+/**
+ * usb_get_dr_mode_from_string - Convert string to dual role mode.
+ * @str: Pointer to the given string
+ *
+ * The function gets string and returns the correspondig enum usb_dr_mode.
+ */
+extern enum usb_dr_mode usb_get_dr_mode_from_string(const char *str);
+
+/**
+ * usb_dr_mode_to_string - Convert dual role mode to string.
+ * @dr_mode: Pointer to the given dual role mode
+ *
+ * The function gets enum usb_dr_mode, and returns the correspondig string.
+ */
+extern const char *usb_dr_mode_to_string(const enum usb_dr_mode dr_mode);
+
 #endif /* __LINUX_USB_OTG_H */
-- 
2.17.1