[v5 PATCH 1/5] extcon: Add Type-C and DP support

Chris Zhong
2016-07-12T15:10:09Z

Add EXTCON_DISP_DP for the Display external connector. For Type-C
connector the DisplayPort can work as an Alternate Mode(VESA DisplayPort
Alt Mode on USB Type-C Standard). The Type-C support both normal and
flipped orientation, so add a property to extcon.

Signe-off-by: Chris Zhong <zyw@rock-chips.com>

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
---

Changes in v5:
- support get property

Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

drivers/extcon/extcon.c | 28 ++++++++++++++++++++++++++++
include/linux/extcon.h | 13 +++++++++++++
2 files changed, 41 insertions(+)

diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index a1117db..2591b28 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -157,6 +157,11 @@ struct __extcon_info {
.id = EXTCON_DISP_VGA,
.name = "VGA",
},
+ [EXTCON_DISP_DP] = {
+ .type = EXTCON_TYPE_DISP,
+ .id = EXTCON_DISP_DP,
+ .name = "DP",
+ },

/* Miscellaneous external connector */
[EXTCON_DOCK] = {
@@ -270,6 +275,7 @@ static bool is_extcon_property_supported(unsigned int id,
switch (prop) {
case EXTCON_PROP_USB_ID:
case EXTCON_PROP_USB_VBUS:
+ case EXTCON_PROP_TYPEC_POLARITY:
return true;
default:
break;
@@ -286,6 +292,8 @@ static bool is_extcon_property_supported(unsigned int id,
}
case EXTCON_TYPE_DISP:
switch (prop) {
+ case EXTCON_PROP_TYPEC_POLARITY:
+ return true;
default:
break;
}
@@ -547,6 +555,26 @@ int extcon_get_cable_property(struct extcon_dev *edev, unsigned int id,
enum extcon_property prop,
union extcon_property_value *val)
{
+ struct extcon_cable *cable;
+ int index;
+
+ if (!edev)
+ return -EINVAL;
+
+ /* Check the property whether is supported or not */
+ if (!is_extcon_property_supported(id, prop))
+ return -EINVAL;
+
+ /* Find the cable index of external connector by using id */
+ index = find_cable_index_by_id(edev, id);
+ if (index < 0)
+ return index;
+
+ /* Store the property value */
+ cable = &edev->cables[index];
+
+ val->intval = cable->propval[prop].intval;
+
return 0;
}

diff --git a/include/linux/extcon.h b/include/linux/extcon.h
index f6f0a8d..50ef87f 100644
--- a/include/linux/extcon.h
+++ b/include/linux/extcon.h
@@ -77,6 +77,7 @@ enum extcon_type {
#define EXTCON_DISP_MHL 41 /* Mobile High-Definition Link */
#define EXTCON_DISP_DVI 42 /* Digital Visual Interface */
#define EXTCON_DISP_VGA 43 /* Video Graphics Array */
+#define EXTCON_DISP_DP 44 /* DisplayPort */

/* Miscellaneous external connector */
#define EXTCON_DOCK 60
@@ -108,9 +109,13 @@ enum extcon_property {
* - EXTCON_PROP_USB_USB
* @type: integer (int value)
* @value: 0 (low) or 1 (high)
+ * - EXTCON_PROP_TYPEC_POLARITY,
+ * @type: integer (int value)
+ * @value: 0 (normal) or 1 (flip)
*/
EXTCON_PROP_USB_ID = 0,
EXTCON_PROP_USB_VBUS,
+ EXTCON_PROP_TYPEC_POLARITY,

/* Properties of EXTCON_TYPE_CHG. */
/* Properties of EXTCON_TYPE_JACK. */
@@ -225,6 +230,14 @@ extern int extcon_get_cable_state_(struct extcon_dev *edev, unsigned int id);
extern int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
bool cable_state);

+extern int extcon_get_cable_property(struct extcon_dev *edev, unsigned int id,
+ enum extcon_property prop,
+ union extcon_property_value *val);
+
+extern int extcon_set_cable_property(struct extcon_dev *edev, unsigned int id,
+ enum extcon_property prop,
+ union extcon_property_value val);
+
/*
* Following APIs are to monitor every action of a notifier.
* Registrar gets notified for every external port of a connection device.
--
2.6.3