[PATCH v2 20/42] misc/mei/hdcp: Closing wired HDCP2.2 Tx Session

[Ramalingam C]

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.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 63 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mei_hdcp.h         |  5 ++++
 2 files changed, 68 insertions(+)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index c73715ba9693..e237ddb44b9d 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -765,6 +765,69 @@ int mei_enable_hdcp_authentication(struct mei_hdcp_data *data)
 }
 EXPORT_SYMBOL(mei_enable_hdcp_authentication);
 
+/**
+ * me_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_hdcp_data *data)
+{
+	struct wired_cmd_close_session_in session_close_in = { { 0 } };
+	struct wired_cmd_close_session_out session_close_out = { { 0 } };
+	enum me_hdcp_status status;
+	struct device *dev;
+	ssize_t byte;
+
+	if (!data)
+		return -EINVAL;
+
+	/* check for the mei_device enabled or not */
+	if (!mei_cldev_active_and_enabled(data->cldev))
+		return -ENODEV;
+
+	dev = &data->cldev->dev;
+
+	/* Fill header details */
+	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;
+
+	/* Fill in the In Data */
+	session_close_in.port.integrated_port_type = data->port_type;
+	session_close_in.port.physical_port = data->port;
+
+
+	/* Request to ME */
+	byte = mei_cldev_send(data->cldev, (u8 *)&session_close_in,
+			      sizeof(session_close_in));
+	if (byte < 0) {
+		dev_err(dev, "mei_cldev_send failed. %d\n", (int)byte);
+		return byte;
+	}
+
+	/* Response from ME */
+	byte = mei_cldev_recv(data->cldev, (u8 *)&session_close_out,
+			      sizeof(session_close_out));
+	if (byte < 0) {
+		dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte);
+		return byte;
+	}
+
+	status = (enum me_hdcp_status)session_close_out.header.status;
+	if (status != ME_HDCP_STATUS_SUCCESS) {
+		dev_err(dev, "Session Close Failed. status: 0x%X\n", status);
+		return -1;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(mei_close_hdcp_session);
+
 static int mei_hdcp_probe(struct mei_cl_device *cldev,
 			  const struct mei_cl_device_id *id)
 {
diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h
index cb8bf3b0f022..031251a1424a 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -129,6 +129,7 @@ mei_repeater_check_flow_prepare_ack(struct mei_hdcp_data *data,
 int mei_verify_mprime(struct mei_hdcp_data *data,
 		      struct hdcp2_rep_stream_ready *stream_ready);
 int mei_enable_hdcp_authentication(struct mei_hdcp_data *data);
+int mei_close_hdcp_session(struct mei_hdcp_data *data);
 #else
 static inline
 int mei_hdcp_cldev_get_reference(void *client_data,
@@ -206,5 +207,9 @@ static inline int mei_enable_hdcp_authentication(struct mei_hdcp_data *data)
 {
 	return -ENODEV;
 }
+static inline int mei_close_hdcp_session(struct mei_hdcp_data *data)
+{
+	return -ENODEV;
+}
 #endif /* defined (CONFIG_INTEL_MEI_HDCP) */
 #endif /* defined (_LINUX_MEI_HDCP_H) */
-- 
2.7.4