[v4,11/41] misc/mei/hdcp: Store the HDCP Pairing info

Commit Message

Ramalingam C May 21, 2018, 12:53 p.m. UTC

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.
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 fixed [Uma]

Signed-off-by: Ramalingam C <[e-mail]>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 61 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mei_hdcp.h         | 10 +++++++
 2 files changed, 71 insertions(+)

Patch

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index a521d111751a..878485e53d5a 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -247,6 +247,67 @@  int mei_verify_hprime(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
 }
 EXPORT_SYMBOL(mei_verify_hprime);
 
+/*
+ * mei_store_pairing_info:
+ *	Function to store pairing info received from panel
+ *
+ * cldev		: Pointer for mei client device
+ * 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_cl_device *cldev,
+			   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 } };
+	struct device *dev;
+	ssize_t byte;
+
+	if (!data || !pairing_info)
+		return -EINVAL;
+
+	dev = &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));
+
+	byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
+			      sizeof(pairing_info_in));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
+			      sizeof(pairing_info_out));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) {
+		dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
+			WIRED_AKE_SEND_PAIRING_INFO,
+			pairing_info_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(mei_store_pairing_info);
+
 static void
 mei_cldev_state_notify_clients(struct mei_cl_device *cldev, bool enabled)
 {
diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h
index b97eb4d15393..23291d073d4b 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -119,6 +119,9 @@  mei_verify_receiver_cert_prepare_km(struct mei_cl_device *cldev,
 				    size_t *msg_sz);
 int mei_verify_hprime(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
 		      struct hdcp2_ake_send_hprime *rx_hprime);
+int mei_store_pairing_info(struct mei_cl_device *cldev,
+			   struct mei_hdcp_data *data,
+			   struct hdcp2_ake_send_pairing_info *pairing_info);
 #else
 static inline int mei_cldev_register_notify(struct notifier_block *nb)
 {
@@ -155,5 +158,12 @@  int mei_verify_hprime(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
 {
 	return -ENODEV;
 }
+static inline
+int mei_store_pairing_info(struct mei_cl_device *cldev,
+			   struct mei_hdcp_data *data,
+			   struct hdcp2_ake_send_pairing_info *pairing_info)
+{
+	return -ENODEV;
+}
 #endif /* IS_ENABLED(CONFIG_INTEL_MEI_HDCP) */
 #endif /* defined (_LINUX_MEI_HDCP_H) */