drm/i915: header for i915 - MEI_HDCP interface

Header defines the interface for the I915 and MEI_HDCP drivers.
This interface is specific to the usage of mei_hdcp from gen9+
platforms for ME FW based HDCP2.2 services.

And Generic HDCP2.2 protocol specific definitions
are added at drm/drm_hdcp.h.

v2:
  Commit msg is enhanced [Daniel]
v3:
  i915_hdcp_comp_master is defined.
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> [v2]
Reviewed-by: Uma Shankar <uma.shankar@intel.com> [v2]
[danvet: Fix subject to drm/i915.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550219730-17734-4-git-send-email-ramalingam.c@intel.com

include/drm/i915_mei_hdcp_interface.h

+/* SPDX-License-Identifier: (GPL-2.0+) */
+/*
+ * Copyright © 2017-2018 Intel Corporation
+ *
+ * Authors:
+ * Ramalingam C <ramalingam.c@intel.com>
+ */
+
+#ifndef _I915_MEI_HDCP_INTERFACE_H_
+#define _I915_MEI_HDCP_INTERFACE_H_
+
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <drm/drm_hdcp.h>
+#include <drm/i915_drm.h>
+
+/**
+ * enum hdcp_port_type - HDCP port implementation type defined by ME FW
+ * @HDCP_PORT_TYPE_INVALID: Invalid hdcp port type
+ * @HDCP_PORT_TYPE_INTEGRATED: In-Host HDCP2.x port
+ * @HDCP_PORT_TYPE_LSPCON: HDCP2.2 discrete wired Tx port with LSPCON
+ *			   (HDMI 2.0) solution
+ * @HDCP_PORT_TYPE_CPDP: HDCP2.2 discrete wired Tx port using the CPDP (DP 1.3)
+ *			 solution
+ */
+enum hdcp_port_type {
+	HDCP_PORT_TYPE_INVALID,
+	HDCP_PORT_TYPE_INTEGRATED,
+	HDCP_PORT_TYPE_LSPCON,
+	HDCP_PORT_TYPE_CPDP
+};
+
+/**
+ * enum hdcp_wired_protocol - HDCP adaptation used on the port
+ * @HDCP_PROTOCOL_INVALID: Invalid HDCP adaptation protocol
+ * @HDCP_PROTOCOL_HDMI: HDMI adaptation of HDCP used on the port
+ * @HDCP_PROTOCOL_DP: DP adaptation of HDCP used on the port
+ */
+enum hdcp_wired_protocol {
+	HDCP_PROTOCOL_INVALID,
+	HDCP_PROTOCOL_HDMI,
+	HDCP_PROTOCOL_DP
+};
+
+/**
+ * struct hdcp_port_data - intel specific HDCP port data
+ * @port: port index as per I915
+ * @port_type: HDCP port type as per ME FW classification
+ * @protocol: HDCP adaptation as per ME FW
+ * @k: No of streams transmitted on a port. Only on DP MST this is != 1
+ * @seq_num_m: Count of RepeaterAuth_Stream_Manage msg propagated.
+ *	       Initialized to 0 on AKE_INIT. Incremented after every successful
+ *	       transmission of RepeaterAuth_Stream_Manage message. When it rolls
+ *	       over re-Auth has to be triggered.
+ * @streams: struct hdcp2_streamid_type[k]. Defines the type and id for the
+ *	     streams
+ */
+struct hdcp_port_data {
+	enum port port;
+	u8 port_type;
+	u8 protocol;
+	u16 k;
+	u32 seq_num_m;
+	struct hdcp2_streamid_type *streams;
+};
+
+/**
+ * struct i915_hdcp_component_ops- ops for HDCP2.2 services.
+ * @owner: Module providing the ops
+ * @initiate_hdcp2_session: Initiate a Wired HDCP2.2 Tx Session.
+ *			    And Prepare AKE_Init.
+ * @verify_receiver_cert_prepare_km: Verify the Receiver Certificate
+ *				     AKE_Send_Cert and prepare
+				     AKE_Stored_Km/AKE_No_Stored_Km
+ * @verify_hprime: Verify AKE_Send_H_prime
+ * @store_pairing_info: Store pairing info received
+ * @initiate_locality_check: Prepare LC_Init
+ * @verify_lprime: Verify lprime
+ * @get_session_key: Prepare SKE_Send_Eks
+ * @repeater_check_flow_prepare_ack: Validate the Downstream topology
+ *				     and prepare rep_ack
+ * @verify_mprime: Verify mprime
+ * @enable_hdcp_authentication:  Mark a port as authenticated.
+ * @close_hdcp_session: Close the Wired HDCP Tx session per port.
+ *			This also disables the authenticated state of the port.
+ */
+struct i915_hdcp_component_ops {
+	/**
+	 * @owner: mei_hdcp module
+	 */
+	struct module *owner;
+
+	int (*initiate_hdcp2_session)(struct device *dev,
+				      struct hdcp_port_data *data,
+				      struct hdcp2_ake_init *ake_data);
+	int (*verify_receiver_cert_prepare_km)(struct device *dev,
+					       struct hdcp_port_data *data,
+					       struct hdcp2_ake_send_cert
+								*rx_cert,
+					       bool *km_stored,
+					       struct hdcp2_ake_no_stored_km
+								*ek_pub_km,
+					       size_t *msg_sz);
+	int (*verify_hprime)(struct device *dev,
+			     struct hdcp_port_data *data,
+			     struct hdcp2_ake_send_hprime *rx_hprime);
+	int (*store_pairing_info)(struct device *dev,
+				  struct hdcp_port_data *data,
+				  struct hdcp2_ake_send_pairing_info
+								*pairing_info);
+	int (*initiate_locality_check)(struct device *dev,
+				       struct hdcp_port_data *data,
+				       struct hdcp2_lc_init *lc_init_data);
+	int (*verify_lprime)(struct device *dev,
+			     struct hdcp_port_data *data,
+			     struct hdcp2_lc_send_lprime *rx_lprime);
+	int (*get_session_key)(struct device *dev,
+			       struct hdcp_port_data *data,
+			       struct hdcp2_ske_send_eks *ske_data);
+	int (*repeater_check_flow_prepare_ack)(struct device *dev,
+					       struct hdcp_port_data *data,
+					       struct hdcp2_rep_send_receiverid_list
+								*rep_topology,
+					       struct hdcp2_rep_send_ack
+								*rep_send_ack);
+	int (*verify_mprime)(struct device *dev,
+			     struct hdcp_port_data *data,
+			     struct hdcp2_rep_stream_ready *stream_ready);
+	int (*enable_hdcp_authentication)(struct device *dev,
+					  struct hdcp_port_data *data);
+	int (*close_hdcp_session)(struct device *dev,
+				  struct hdcp_port_data *data);
+};
+
+/**
+ * struct i915_hdcp_component_master - Used for communication between i915
+ * and mei_hdcp drivers for the HDCP2.2 services
+ * @mei_dev: device that provide the HDCP2.2 service from MEI Bus.
+ * @hdcp_ops: Ops implemented by mei_hdcp driver, used by i915 driver.
+ */
+struct i915_hdcp_comp_master {
+	struct device *mei_dev;
+	const struct i915_hdcp_component_ops *ops;
+
+	/* To protect the above members. */
+	struct mutex mutex;
+};
+
+#endif /* _I915_MEI_HDCP_INTERFACE_H_ */