[Intel-gfx] [PATCH v2 13/42] misc/mei/hdcp: Store the HDCP Pairing info

[Ramalingam C]

Provides Pairing info to ME to store.

Pairing is a process to fast track the subsequent authentication
with the same HDCP sink.

On Success, received HDCP pairing info is stored in non-volatile
memory of ME.

v2:
  Rebased.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 66 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mei_hdcp.h         |  8 +++++
 2 files changed, 74 insertions(+)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 37faca9a3cc8..753a6a466611 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -273,6 +273,72 @@ int mei_verify_hprime(struct mei_hdcp_data *data,
 }
 EXPORT_SYMBOL(mei_verify_hprime);
 
+/**
+ * mei_store_pairing_info:
+ *	Function to store pairing info received from panel
+ *
+ * @data		: Intel HW specific Data
+ * @pairing_info	: Pointer for AKE_Send_Pairing_Info
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+
+int mei_store_pairing_info(struct mei_hdcp_data *data,
+			   struct hdcp2_ake_send_pairing_info *pairing_info)
+{
+	struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
+	struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
+	enum me_hdcp_status status = ME_HDCP_STATUS_UNKNOWN_ERROR;
+	struct device *dev;
+	ssize_t byte;
+
+	if (!data || !pairing_info)
+		return -EINVAL;
+
+	/* check for the mei_device enabled or not */
+	if (!mei_cldev_active_and_enabled(data->cldev))
+		return -ENODEV;
+
+	dev = &data->cldev->dev;
+
+	pairing_info_in.header.api_version = HDCP_API_VERSION;
+	pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
+	pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS;
+	pairing_info_in.header.buffer_len =
+					WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;
+
+	pairing_info_in.port.integrated_port_type = data->port_type;
+	pairing_info_in.port.physical_port = data->port;
+
+	memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
+	       sizeof(pairing_info_in.e_kh_km));
+
+	/* Request to ME */
+	byte = mei_cldev_send(data->cldev, (u8 *)&pairing_info_in,
+			      sizeof(pairing_info_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 *)&pairing_info_out,
+			      sizeof(pairing_info_out));
+	if (byte < 0) {
+		dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte);
+		return byte;
+	}
+
+	status = (enum me_hdcp_status)pairing_info_out.header.status;
+	if (status != ME_HDCP_STATUS_SUCCESS) {
+		dev_err(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
+			WIRED_AKE_SEND_PAIRING_INFO, status);
+		return -1;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(mei_store_pairing_info);
+
 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 3590e3421134..449ac3af4d53 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -113,6 +113,8 @@ mei_verify_receiver_cert_prepare_km(struct mei_hdcp_data *data,
 				    size_t *msg_sz);
 int mei_verify_hprime(struct mei_hdcp_data *data,
 		      struct hdcp2_ake_send_hprime *rx_hprime);
+int mei_store_pairing_info(struct mei_hdcp_data *data,
+			   struct hdcp2_ake_send_pairing_info *pairing_info);
 #else
 static inline
 int mei_hdcp_cldev_get_reference(void *client_data,
@@ -148,5 +150,11 @@ int mei_verify_hprime(struct mei_hdcp_data *data,
 {
 	return -ENODEV;
 }
+static inline
+int mei_store_pairing_info(struct mei_hdcp_data *data,
+			   struct hdcp2_ake_send_pairing_info *pairing_info)
+{
+	return -ENODEV;
+}
 #endif /* defined (CONFIG_INTEL_MEI_HDCP) */
 #endif /* defined (_LINUX_MEI_HDCP_H) */
-- 
2.7.4