Commit 73e33008 authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Greg Kroah-Hartman
Browse files

usb: roles: add helper usb_role_string() 



Introduces usb_role_string() function, which returns a
human-readable name of provided usb role, it's useful to
make the log readable.

Reviewed-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarChunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1621932786-9335-1-git-send-email-chunfeng.yun@mediatek.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a0765597

drivers/usb/roles/class.c

+9 −0
Original line number Diff line number Diff line
@@ -214,6 +214,15 @@ static const char * const usb_roles[] = { 
	[USB_ROLE_DEVICE]	= "device",

};



const char *usb_role_string(enum usb_role role)

{

	if (role < 0 || role >= ARRAY_SIZE(usb_roles))

		return "unknown";



	return usb_roles[role];

}

EXPORT_SYMBOL_GPL(usb_role_string);



static ssize_t

role_show(struct device *dev, struct device_attribute *attr, char *buf)

{

include/linux/usb/role.h

+6 −0
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ void usb_role_switch_unregister(struct usb_role_switch *sw); 


void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data);

void *usb_role_switch_get_drvdata(struct usb_role_switch *sw);

const char *usb_role_string(enum usb_role role);

#else

static inline int usb_role_switch_set_role(struct usb_role_switch *sw,

		enum usb_role role)
@@ -109,6 +110,11 @@ static inline void *usb_role_switch_get_drvdata(struct usb_role_switch *sw) 
	return NULL;

}



static inline const char *usb_role_string(enum usb_role role)

{

	return "unknown";

}



#endif



#endif /* __LINUX_USB_ROLE_H */