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usb: roles: Introduce stubs for the exiting functions in role.h

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This patch adds stubs for the exiting functions while
CONFIG_USB_ROLE_SWITCH does not enabled.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1567070558-29417-6-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yu Chen 2019-08-29 17:22:32 +08:00 committed by Greg Kroah-Hartman
parent 3ef8685f84
commit 977607653c
1 changed files with 30 additions and 0 deletions
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30
include/linux/usb/role.h
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@ -42,6 +42,8 @@ struct usb_role_switch_desc {
bool allow_userspace_control;
};
#if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role);
enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw);
struct usb_role_switch *usb_role_switch_get(struct device *dev);
@ -51,5 +53,33 @@ struct usb_role_switch *
usb_role_switch_register(struct device *parent,
const struct usb_role_switch_desc *desc);
void usb_role_switch_unregister(struct usb_role_switch *sw);
#else
static inline int usb_role_switch_set_role(struct usb_role_switch *sw,
enum usb_role role)
{
return 0;
}
static inline enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
{
return USB_ROLE_NONE;
}
static inline struct usb_role_switch *usb_role_switch_get(struct device *dev)
{
return ERR_PTR(-ENODEV);
}
static inline void usb_role_switch_put(struct usb_role_switch *sw) { }
static inline struct usb_role_switch *
usb_role_switch_register(struct device *parent,
const struct usb_role_switch_desc *desc)
{
return ERR_PTR(-ENODEV);
}
static inline void usb_role_switch_unregister(struct usb_role_switch *sw) { }
#endif
#endif /* __LINUX_USB_ROLE_H */