[PATCH v2 14/42] misc/mei/hdcp: Initiate Locality check

[Ramalingam C]

Requests ME to start the second stage of HDCP2.2 authentication,
called Locality Check.

On Success, ME FW will provide LC_Init message to send to hdcp sink.

v2:
  Rebased.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 64 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mei_hdcp.h         |  8 +++++
 2 files changed, 72 insertions(+)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 753a6a466611..ff19de58222f 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -339,6 +339,70 @@ int mei_store_pairing_info(struct mei_hdcp_data *data,
 }
 EXPORT_SYMBOL(mei_store_pairing_info);
 
+/**
+ * mei_initiate_locality_check:
+ *	Function to prepare LC_Init.
+ *
+ * @data		: Intel HW specific Data
+ * @hdcp2_lc_init	: Pointer for storing LC_Init
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+int mei_initiate_locality_check(struct mei_hdcp_data *data,
+				struct hdcp2_lc_init *lc_init_data)
+{
+	struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
+	struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
+	enum me_hdcp_status status;
+	struct device *dev;
+	ssize_t byte;
+
+	if (!data || !lc_init_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;
+
+	lc_init_in.header.api_version = HDCP_API_VERSION;
+	lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
+	lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
+	lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;
+
+	lc_init_in.port.integrated_port_type = data->port_type;
+	lc_init_in.port.physical_port = data->port;
+
+	/* Request to ME */
+	byte = mei_cldev_send(data->cldev, (u8 *)&lc_init_in,
+			      sizeof(lc_init_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 *)&lc_init_out,
+			      sizeof(lc_init_out));
+	if (byte < 0) {
+		dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte);
+		return byte;
+	}
+
+	status = (enum me_hdcp_status)lc_init_out.header.status;
+	if (status != ME_HDCP_STATUS_SUCCESS) {
+		dev_err(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
+			WIRED_INIT_LOCALITY_CHECK, status);
+		return -1;
+	}
+
+	lc_init_data->msg_id = HDCP_2_2_LC_INIT;
+	memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);
+	return 0;
+}
+EXPORT_SYMBOL(mei_initiate_locality_check);
+
 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 449ac3af4d53..fd8a26dddacb 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -115,6 +115,8 @@ 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);
+int mei_initiate_locality_check(struct mei_hdcp_data *data,
+				struct hdcp2_lc_init *lc_init_data);
 #else
 static inline
 int mei_hdcp_cldev_get_reference(void *client_data,
@@ -156,5 +158,11 @@ int mei_store_pairing_info(struct mei_hdcp_data *data,
 {
 	return -ENODEV;
 }
+static inline
+int mei_initiate_locality_check(struct mei_hdcp_data *data,
+				struct hdcp2_lc_init *lc_init_data)
+{
+	return -ENODEV;
+}
 #endif /* defined (CONFIG_INTEL_MEI_HDCP) */
 #endif /* defined (_LINUX_MEI_HDCP_H) */
-- 
2.7.4