[PATCH v2 05/13] usb: common: add helper to get role-switch-default-mode
From: Chunfeng Yun <chunfeng.yun@mediatek.com>
Date: 2021-06-18 09:30:16
Also in:
linux-arm-kernel, linux-mediatek, linux-usb, lkml
Subsystem:
the rest, usb subsystem · Maintainers:
Linus Torvalds, Greg Kroah-Hartman
Add helper to get "role-switch-default-mode", and convert it to the corresponding enum usb_dr_mode Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> --- v2: no changes --- drivers/usb/common/common.c | 20 ++++++++++++++++++++ include/linux/usb/otg.h | 1 + 2 files changed, 21 insertions(+)
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 347fb3d3894a..c9bdeb4ddcb5 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c@@ -200,6 +200,26 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev) } EXPORT_SYMBOL_GPL(usb_get_dr_mode); +/** + * usb_get_role_switch_default_mode - Get default mode for given device + * @dev: Pointer to the given device + * + * The function gets string from property 'role-switch-default-mode', + * and returns the corresponding enum usb_dr_mode. + */ +enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev) +{ + const char *str; + int ret; + + ret = device_property_read_string(dev, "role-switch-default-mode", &str); + if (ret < 0) + return USB_DR_MODE_UNKNOWN; + + return usb_get_dr_mode_from_string(str); +} +EXPORT_SYMBOL_GPL(usb_get_role_switch_default_mode); + /** * usb_decode_interval - Decode bInterval into the time expressed in 1us unit * @epd: The descriptor of the endpoint
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 69f1b6328532..1550b8e5f039 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h@@ -128,5 +128,6 @@ enum usb_dr_mode { * and returns the correspondig enum usb_dr_mode */ extern enum usb_dr_mode usb_get_dr_mode(struct device *dev); +extern enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev); #endif /* __LINUX_USB_OTG_H */
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2.18.0