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authorBaolin Wang <baolin.wang@linaro.org>2016-12-21 14:10:47 +0800
committerChanwoo Choi <cw00.choi@samsung.com>2017-01-09 10:04:11 +0900
commitdb6228612ce297949621a62e9d2331ee55016778 (patch)
treea0818190694e19f0a2a18f2a545922c8886984e0 /include/linux/extcon.h
parent01b4c9a1ae07a25d208cad0da7dd288007a22984 (diff)
extcon: Add documentation for EXTCON_CHG_USB_* and EXTCON_USB_*
Current there is both "EXTCON_USB" and "EXTCON_CHG_USB_SDP" which both seem to suggest a standard downstream port. But there is no documentation describing how these relate. Thus add documentation to describe EXTCON_CHG_USB_SDP should always appear together with EXTCON_USB, and EXTCON_CHG_USB_ACA would normally appear with EXTCON_USB_HOST. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'include/linux/extcon.h')
-rw-r--r--include/linux/extcon.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/extcon.h b/include/linux/extcon.h
index b871c0cb1f02..00201230bea5 100644
--- a/include/linux/extcon.h
+++ b/include/linux/extcon.h
@@ -46,7 +46,14 @@
#define EXTCON_USB 1
#define EXTCON_USB_HOST 2
-/* Charging external connector */
+/*
+ * Charging external connector
+ *
+ * When one SDP charger connector was reported, we should also report
+ * the USB connector, which means EXTCON_CHG_USB_SDP should always
+ * appear together with EXTCON_USB. The same as ACA charger connector,
+ * EXTCON_CHG_USB_ACA would normally appear with EXTCON_USB_HOST.
+ */
#define EXTCON_CHG_USB_SDP 5 /* Standard Downstream Port */
#define EXTCON_CHG_USB_DCP 6 /* Dedicated Charging Port */
#define EXTCON_CHG_USB_CDP 7 /* Charging Downstream Port */