[PATCH v4 12/41] misc/mei/hdcp: Initiate Locality check

[Ramalingam C <ramalingam.c@intel.com>]

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.
v3:
  cldev is passed as first parameter [Tomas]
  Redundant comments and cast are removed [Tomas]
v4:
  %zd used for ssize_t [Alexander]
  %s/return -1/return -EIO [Alexander]
  Style fixed [Uma]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 57 ++++++++++++++++++++++++++++++++++++++++
 include/linux/mei_hdcp.h         | 10 +++++++
 2 files changed, 67 insertions(+)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 878485e53d5a..324e50736518 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -308,6 +308,63 @@ int mei_store_pairing_info(struct mei_cl_device *cldev,
 }
 EXPORT_SYMBOL(mei_store_pairing_info);
 
+/*
+ * mei_initiate_locality_check:
+ *	Function to prepare LC_Init.
+ *
+ * cldev		: Pointer for mei client device
+ * 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_cl_device *cldev,
+				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 } };
+	struct device *dev;
+	ssize_t byte;
+
+	if (!data || !lc_init_data)
+		return -EINVAL;
+
+	dev = &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;
+
+	byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (lc_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
+		dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
+			WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
+		return -EIO;
+	}
+
+	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 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 23291d073d4b..54453c34d54e 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -122,6 +122,9 @@ int mei_verify_hprime(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
 int mei_store_pairing_info(struct mei_cl_device *cldev,
 			   struct mei_hdcp_data *data,
 			   struct hdcp2_ake_send_pairing_info *pairing_info);
+int mei_initiate_locality_check(struct mei_cl_device *cldev,
+				struct mei_hdcp_data *data,
+				struct hdcp2_lc_init *lc_init_data);
 #else
 static inline int mei_cldev_register_notify(struct notifier_block *nb)
 {
@@ -165,5 +168,12 @@ int mei_store_pairing_info(struct mei_cl_device *cldev,
 {
 	return -ENODEV;
 }
+static inline
+int mei_initiate_locality_check(struct mei_cl_device *cldev,
+				struct mei_hdcp_data *data,
+				struct hdcp2_lc_init *lc_init_data)
+{
+	return -ENODEV;
+}
 #endif /* IS_ENABLED(CONFIG_INTEL_MEI_HDCP) */
 #endif /* defined (_LINUX_MEI_HDCP_H) */
-- 
2.7.4

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