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]
v5: Rebased.
v6:
  Collected the Rb-ed by.
  Rebasing.
v7:
  Adjust to the new mei interface.
  Fix for Kdoc.
v8:
  K-Doc addition. [Tomas]

Signed-off-by: Ramalingam C <ramalinga...@intel.com>
Reviewed-by: Uma Shankar <uma.shan...@intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 56 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 55 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 809d6270b6c1..db1492f64d6b 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -281,6 +281,60 @@ mei_store_pairing_info(struct device *dev, struct 
hdcp_port_data *data,
        return 0;
 }
 
+/**
+ * mei_initiate_locality_check() - Prepare LC_Init
+ * @dev: device corresponding to the mei_cl_device
+ * @hdcp_data: Intel HW specific hdcp data
+ * @lc_init_data: LC_Init msg output
+ *
+ * Return: 0 on Success, <0 on Failure
+ */
+static int
+mei_initiate_locality_check(struct device *dev, struct hdcp_port_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 mei_cl_device *cldev;
+       ssize_t byte;
+
+       if (!dev || !data || !lc_init_data)
+               return -EINVAL;
+
+       cldev = to_mei_cl_device(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 = (u8)GET_MEI_DDI_INDEX(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;
+}
+
 static __attribute__((unused))
 struct i915_hdcp_component_ops mei_hdcp_ops = {
        .owner = THIS_MODULE,
@@ -288,7 +342,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
        .verify_receiver_cert_prepare_km = mei_verify_receiver_cert_prepare_km,
        .verify_hprime = mei_verify_hprime,
        .store_pairing_info = mei_store_pairing_info,
-       .initiate_locality_check = NULL,
+       .initiate_locality_check = mei_initiate_locality_check,
        .verify_lprime = NULL,
        .get_session_key = NULL,
        .repeater_check_flow_prepare_ack = NULL,
-- 
2.7.4

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