| Message ID | 1621932786-9335-1-git-send-email-chunfeng.yun@mediatek.com |
|---|---|
| State | New |
| Headers | show |
| Series | [1/2] usb: roles: add helper usb_role_string() | expand |
On Tue, May 25, 2021 at 04:53:05PM +0800, Chunfeng Yun wrote: > Introduces usb_role_string() function, which returns a > human-readable name of provided usb role, it's useful to > make the log readable. > > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > --- > drivers/usb/roles/class.c | 9 +++++++++ > include/linux/usb/role.h | 6 ++++++ > 2 files changed, 15 insertions(+) > > diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c > index 33b637d0d8d9..dfaed7eee94f 100644 > --- a/drivers/usb/roles/class.c > +++ b/drivers/usb/roles/class.c > @@ -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) > { > diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h > index 0164fed31b06..031f148ab373 100644 > --- a/include/linux/usb/role.h > +++ b/include/linux/usb/role.h > @@ -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 */ > -- > 2.18.0 -- heikki
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index 33b637d0d8d9..dfaed7eee94f 100644 --- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -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) { diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h index 0164fed31b06..031f148ab373 100644 --- a/include/linux/usb/role.h +++ b/include/linux/usb/role.h @@ -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 */
Introduces usb_role_string() function, which returns a human-readable name of provided usb role, it's useful to make the log readable. Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> --- drivers/usb/roles/class.c | 9 +++++++++ include/linux/usb/role.h | 6 ++++++ 2 files changed, 15 insertions(+)