[PATCH v4 18/41] misc/mei/hdcp: Closing wired HDCP2.2 Tx Session

[Ramalingam C <ramalingam.c@intel.com>]

Request the ME to terminate the HDCP2.2 session for a port.

On Success, ME FW will mark the intel port as Deauthenticated and
terminate the wired HDCP2.2 Tx session started due to the cmd
WIRED_INITIATE_HDCP2_SESSION.

v2:
  Rebased.
v3:
  cldev is passed as first parameter [Tomas]
  Redundant comments and cast are removed [Tomas]
v4:
  %zd for ssize_t [Alexander]
  %s/return -1/return -EIO [Alexander]
  Style and typos fixed [Uma]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 56 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mei_hdcp.h         |  7 +++++
 2 files changed, 63 insertions(+)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index cbd3a8a3ae3e..34292e279f8a 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -682,6 +682,62 @@ int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
 }
 EXPORT_SYMBOL(mei_enable_hdcp_authentication);
 
+/*
+ * mei_close_hdcp_session:
+ *	Function to close the Wired HDCP Tx session of ME FW.
+ *	This also disables the authenticated state of the port.
+ *
+ * data			: Intel HW specific Data
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+int mei_close_hdcp_session(struct mei_cl_device *cldev,
+			   struct mei_hdcp_data *data)
+{
+	struct wired_cmd_close_session_in session_close_in = { { 0 } };
+	struct wired_cmd_close_session_out session_close_out = { { 0 } };
+	struct device *dev;
+	ssize_t byte;
+
+	if (!data)
+		return -EINVAL;
+
+	dev = &cldev->dev;
+
+	session_close_in.header.api_version = HDCP_API_VERSION;
+	session_close_in.header.command_id = WIRED_CLOSE_SESSION;
+	session_close_in.header.status = ME_HDCP_STATUS_SUCCESS;
+	session_close_in.header.buffer_len =
+				WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN;
+
+	session_close_in.port.integrated_port_type = data->port_type;
+	session_close_in.port.physical_port = data->port;
+
+
+	byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
+			      sizeof(session_close_in));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	byte = mei_cldev_recv(cldev, (u8 *)&session_close_out,
+			      sizeof(session_close_out));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (session_close_out.header.status != ME_HDCP_STATUS_SUCCESS) {
+		dev_dbg(dev, "Session Close Failed. status: 0x%X\n",
+			session_close_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(mei_close_hdcp_session);
+
 static void
 mei_cldev_state_notify_clients(struct mei_cl_device *cldev, bool enabled)
 {
diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h
index e6b6f9ace0c2..43bd81488a3a 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -139,6 +139,8 @@ int mei_verify_mprime(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
 		      struct hdcp2_rep_stream_ready *stream_ready);
 int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
 				   struct mei_hdcp_data *data);
+int mei_close_hdcp_session(struct mei_cl_device *cldev,
+			   struct mei_hdcp_data *data);
 #else
 static inline int mei_cldev_register_notify(struct notifier_block *nb)
 {
@@ -221,5 +223,10 @@ static inline int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
 {
 	return -ENODEV;
 }
+static inline int mei_close_hdcp_session(struct mei_cl_device *cldev,
+					 struct mei_hdcp_data *data)
+{
+	return -ENODEV;
+}
 #endif /* IS_ENABLED(CONFIG_INTEL_MEI_HDCP) */
 #endif /* defined (_LINUX_MEI_HDCP_H) */
-- 
2.7.4

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