[PATCH v3 08/40] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

[Ramalingam C]

Request ME FW to start the HDCP2.2 session for a intel port.
Prepares payloads for command WIRED_INITIATE_HDCP2_SESSION and sent
to ME FW.

On Success, ME FW will start a HDCP2.2 session for the port and
provides the content for HDCP2.2 AKE_Init message.

v2:
  Rebased.
v3:
  cldev is add as a separate parameter [Tomas]
  Redundant comment and typecast are removed [Tomas]

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 68 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mei_hdcp.h         | 11 +++++++
 2 files changed, 79 insertions(+)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 2811a25f8c57..7caee0947761 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -33,9 +33,77 @@
 #include <linux/mei_cl_bus.h>
 #include <linux/notifier.h>
 #include <linux/mei_hdcp.h>
+#include <drm/drm_connector.h>
+
+#include "mei_hdcp.h"
 
 static BLOCKING_NOTIFIER_HEAD(mei_cldev_notifier_list);
 
+/**
+ * mei_initiate_hdcp2_session:
+ *	Function to start a Wired HDCP2.2 Tx Session with ME FW
+ *
+ * @cldev		: Pointer for mei client device
+ * @data		: Intel HW specific Data
+ * @ake_data		: ptr to store AKE_Init
+ *
+ * Returns 0 on Success, <0 on Failure.
+ */
+int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
+			       struct mei_hdcp_data *data,
+			       struct hdcp2_ake_init *ake_data)
+{
+	struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
+	struct wired_cmd_initiate_hdcp2_session_out
+						session_init_out = { { 0 } };
+	struct device *dev;
+	ssize_t byte;
+
+	if (!data || !ake_data)
+		return -EINVAL;
+
+	dev = &cldev->dev;
+
+	session_init_in.header.api_version = HDCP_API_VERSION;
+	session_init_in.header.command_id = WIRED_INITIATE_HDCP2_SESSION;
+	session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
+	session_init_in.header.buffer_len =
+				WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
+
+	session_init_in.port.integrated_port_type = data->port_type;
+	session_init_in.port.physical_port = data->port;
+	session_init_in.protocol = (uint8_t)data->protocol;
+
+	byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
+			      sizeof(session_init_in));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_send failed. %d\n", (int)byte);
+		return byte;
+	}
+
+	byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
+			      sizeof(session_init_out));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_recv failed. %d\n", (int)byte);
+		return byte;
+	}
+
+	if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
+		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
+			WIRED_INITIATE_HDCP2_SESSION,
+			session_init_out.header.status);
+		return -1;
+	}
+
+	ake_data->msg_id = HDCP_2_2_AKE_INIT;
+	ake_data->tx_caps = session_init_out.tx_caps;
+	memcpy(ake_data->r_tx, session_init_out.r_tx,
+	       sizeof(session_init_out.r_tx));
+
+	return 0;
+}
+EXPORT_SYMBOL(mei_initiate_hdcp2_session);
+
 void mei_cldev_state_notify_clients(struct mei_cl_device *cldev, bool enabled)
 {
 	if (enabled)
diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h
index 634c1a5bdf1e..bb4f27d3abcb 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -28,6 +28,7 @@
 #define _LINUX_MEI_HDCP_H
 
 #include <linux/mei_cl_bus.h>
+#include <drm/drm_hdcp.h>
 
 enum mei_cldev_state {
 	MEI_CLDEV_DISABLED,
@@ -105,6 +106,9 @@ struct mei_hdcp_data {
 #ifdef CONFIG_INTEL_MEI_HDCP
 int mei_cldev_register_notify(struct notifier_block *nb);
 int mei_cldev_unregister_notify(struct notifier_block *nb);
+int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
+			       struct mei_hdcp_data *data,
+			       struct hdcp2_ake_init *ake_data);
 #else
 static int mei_cldev_register_notify(struct notifier_block *nb)
 {
@@ -114,5 +118,12 @@ static int mei_cldev_unregister_notify(struct notifier_block *nb)
 {
 	return -ENODEV;
 }
+static inline
+int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
+			       struct mei_hdcp_data *data,
+			       struct hdcp2_ake_init *ake_data)
+{
+	return -ENODEV;
+}
 #endif /* defined (CONFIG_INTEL_MEI_HDCP) */
 #endif /* defined (_LINUX_MEI_HDCP_H) */
-- 
2.7.4