Request ME to verify the downstream topology information received.
ME FW will validate the Repeaters receiver id list and
downstream topology.
On Success ME FW will provide the Least Significant
128bits of VPrime, which forms the repeater ack.
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 and typos fixed [Uma]
Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
drivers/misc/mei/hdcp/mei_hdcp.c | 75 ++++++++++++++++++++++++++++++++++++++++
include/linux/mei_hdcp.h | 15 ++++++++
2 files changed, 90 insertions(+)
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 36c54c1c69e6..d729348f5ae2 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -484,6 +484,81 @@ int mei_get_session_key(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
}
EXPORT_SYMBOL(mei_get_session_key);
+/*
+ * mei_repeater_check_flow_prepare_ack:
+ * Function to validate the Downstream topology and prepare rep_ack.
+ *
+ * cldev : Pointer for mei client device
+ * data : Intel HW specific Data
+ * rep_topology : Pointer for Receiver Id List to be validated.
+ * rep_send_ack : Pointer for repeater ack
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+int
+mei_repeater_check_flow_prepare_ack(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_rep_send_receiverid_list
+ *rep_topology,
+ struct hdcp2_rep_send_ack *rep_send_ack)
+{
+ struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
+ struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
+ struct device *dev;
+ ssize_t byte;
+
+ if (!rep_topology || !rep_send_ack || !data)
+ return -EINVAL;
+
+ dev = &cldev->dev;
+
+ verify_repeater_in.header.api_version = HDCP_API_VERSION;
+ verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
+ verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS;
+ verify_repeater_in.header.buffer_len =
+ WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
+
+ verify_repeater_in.port.integrated_port_type = data->port_type;
+ verify_repeater_in.port.physical_port = data->port;
+
+ memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
+ HDCP_2_2_RXINFO_LEN);
+ memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
+ HDCP_2_2_SEQ_NUM_LEN);
+ memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
+ HDCP_2_2_LPRIME_HALF_LEN);
+ memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
+ HDCP_2_2_RECEIVER_IDS_MAX_LEN);
+
+ byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
+ sizeof(verify_repeater_in));
+ if (byte < 0) {
+ dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
+ return byte;
+ }
+
+ byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
+ sizeof(verify_repeater_out));
+ if (byte < 0) {
+ dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
+ return byte;
+ }
+
+ if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) {
+ dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
+ WIRED_VERIFY_REPEATER,
+ verify_repeater_out.header.status);
+ return -EIO;
+ }
+
+ memcpy(rep_send_ack->v, verify_repeater_out.v,
+ HDCP_2_2_LPRIME_HALF_LEN);
+ rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
+
+ return 0;
+}
+EXPORT_SYMBOL(mei_repeater_check_flow_prepare_ack);
+
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 d2efa7107339..2713cf321a58 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -129,6 +129,12 @@ int mei_verify_lprime(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
struct hdcp2_lc_send_lprime *rx_lprime);
int mei_get_session_key(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
struct hdcp2_ske_send_eks *ske_data);
+int
+mei_repeater_check_flow_prepare_ack(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_rep_send_receiverid_list
+ *rep_topology,
+ struct hdcp2_rep_send_ack *rep_send_ack);
#else
static inline int mei_cldev_register_notify(struct notifier_block *nb)
{
@@ -191,5 +197,14 @@ int mei_get_session_key(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
{
return -ENODEV;
}
+static inline int
+mei_repeater_check_flow_prepare_ack(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_rep_send_receiverid_list
+ *rep_topology,
+ struct hdcp2_rep_send_ack *rep_send_ack)
+{
+ return -ENODEV;
+}
#endif /* IS_ENABLED(CONFIG_INTEL_MEI_HDCP) */
#endif /* defined (_LINUX_MEI_HDCP_H) */
--
2.7.4
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