From: Hao Wu <hao.wu@xxxxxxxxx>
MHL (Mobile High-Definition Link) shares the same port with USB OTG
to connect mobile device to HDMI and MHL enabled external devices
such as HDTVs. Communication with USB OTG drivers is a must to
decide who (MHL or USB OTG) takes control of the USB OTG port.
This patch adds members to otg data structure to support MHL.
Signed-off-by: Hao Wu <hao.wu@xxxxxxxxx>
---
include/linux/usb/otg.h | 71 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 0a5b371..12b0495 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -33,6 +33,9 @@ enum usb_otg_state {
OTG_STATE_A_PERIPHERAL,
OTG_STATE_A_WAIT_VFALL,
OTG_STATE_A_VBUS_ERR,
+
+ /* MHL mode */
+ OTG_STATE_MHL,
};
enum usb_xceiv_events {
@@ -66,6 +69,7 @@ struct otg_transceiver {
u8 default_a;
enum usb_otg_state state;
+ struct mutex state_mutex;
struct usb_bus *host;
struct usb_gadget *gadget;
@@ -110,6 +114,16 @@ struct otg_transceiver {
/* start or continue HNP role switch */
int (*start_hnp)(struct otg_transceiver *otg);
+ /* enter/exit MHL mode */
+ int (*enter_mhl_mode)(struct otg_transceiver *otg);
+ int (*exit_mhl_mode)(struct otg_transceiver *otg);
+
+ /* MHL support */
+ struct mutex mhl_mutex;
+ /* call this function with mhl_lock held */
+ int (*mhl_notify)(struct otg_transceiver *otg,
+ int event, void *mhldata);
+ void *mhl_data;
};
@@ -230,6 +244,63 @@ otg_start_srp(struct otg_transceiver *otg)
return otg->start_srp(otg);
}
+static inline int
+otg_enter_mhl_mode(struct otg_transceiver *otg)
+{
+ if (otg->enter_mhl_mode)
+ return otg->enter_mhl_mode(otg);
+
+ return -EINVAL;
+}
+
+static inline int
+otg_exit_mhl_mode(struct otg_transceiver *otg)
+{
+ if (otg->exit_mhl_mode)
+ return otg->exit_mhl_mode(otg);
+
+ return -EINVAL;
+}
+
+static inline int
+otg_register_mhl_notify(struct otg_transceiver *otg,
+ int (*mhl_notify)(struct otg_transceiver *, int, void *), void *mhldata)
+{
+ if (mhl_notify == NULL)
+ return -EINVAL;
+
+ mutex_lock(&otg->mhl_mutex);
+ otg->mhl_notify = mhl_notify;
+ otg->mhl_data = mhldata;
+ mutex_unlock(&otg->mhl_mutex);
+
+ return 0;
+}
+
+static inline void
+otg_unregister_mhl_notify(struct otg_transceiver *otg)
+{
+ mutex_lock(&otg->mhl_mutex);
+ if (otg->mhl_notify) {
+ otg->mhl_notify = NULL;
+ otg->mhl_data = NULL;
+ }
+ mutex_unlock(&otg->mhl_mutex);
+}
+
+static inline int
+otg_mhl_notify(struct otg_transceiver *otg, int event)
+{
+ int retval = -EINVAL;
+
+ mutex_lock(&otg->mhl_mutex);
+ if (otg->mhl_notify)
+ retval = otg->mhl_notify(otg, event, otg->mhl_data);
+ mutex_unlock(&otg->mhl_mutex);
+
+ return retval;
+}
+
/* notifiers */
static inline int
otg_register_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
--
1.6.0.6
--
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