[PATCH 21/43] misc/mei/hdcp: Closing wired HDCP2.2 Tx Session

Ramalingam C
2018-02-14T14:20:35Z

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.

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

diff --git a/drivers/misc/mei/mei_hdcp.c b/drivers/misc/mei/mei_hdcp.c
index 030c1604eb57..b4012bd259b8 100644
--- a/drivers/misc/mei/mei_hdcp.c
+++ b/drivers/misc/mei/mei_hdcp.c
@@ -773,6 +773,69 @@ 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_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_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) */