[PATCH v8 30/35] 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.
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]
v5:
  Extra line is removed.
v6:
  No change.
v7:
  Collected the Rb-ed by.
  Rebased.
v8:
  Adjust to the new mei interface.
  Fix for Kdoc.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
Reviewed-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 57 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 08f7310edd68..6e14e7cb49a5 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -650,6 +650,61 @@ static int mei_enable_hdcp_authentication(struct device *dev, void *hdcp_data)
 	return 0;
 }
 
+/*
+ * mei_close_hdcp_session :
+ * Function to close the Wired HDCP Tx session of ME FW.
+ * This also disables the authenticated state of the port.
+ *
+ * @dev : device corresponding to the mei_cl_device
+ * @hdcp_data : Intel HW specific hdcp data
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+static int mei_close_hdcp_session(struct device *dev, void *hdcp_data)
+{
+	struct wired_cmd_close_session_in session_close_in = { { 0 } };
+	struct wired_cmd_close_session_out session_close_out = { { 0 } };
+	struct mei_cl_device *cldev;
+	struct mei_hdcp_data *data = hdcp_data;
+	ssize_t byte;
+
+	if (!dev || !data)
+		return -EINVAL;
+
+	cldev = to_mei_cl_device(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;
+}
+
 static __attribute__((unused))
 struct i915_hdcp_component_ops mei_hdcp_ops = {
 	.owner = THIS_MODULE,
@@ -663,7 +718,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
 	.repeater_check_flow_prepare_ack = mei_repeater_check_flow_prepare_ack,
 	.verify_mprime = mei_verify_mprime,
 	.enable_hdcp_authentication = mei_enable_hdcp_authentication,
-	.close_hdcp_session = NULL,
+	.close_hdcp_session = mei_close_hdcp_session,
 };
 
 static int mei_hdcp_probe(struct mei_cl_device *cldev,
-- 
2.7.4