Requests for the verifcation of AKE_Send_H_prime.
ME will calculation the H and comparing it with received H_Prime. Here AKE_Send_H_prime is a HDCP2.2 Authentication msg.
v2: Rebased.
Signed-off-by: Ramalingam C ramalingam.c@intel.com --- drivers/misc/mei/hdcp/mei_hdcp.c | 65 ++++++++++++++++++++++++++++++++++++++++ include/linux/mei_hdcp.h | 8 +++++ 2 files changed, 73 insertions(+)
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c index 7c3f02c2e324..37faca9a3cc8 100644 --- a/drivers/misc/mei/hdcp/mei_hdcp.c +++ b/drivers/misc/mei/hdcp/mei_hdcp.c @@ -208,6 +208,71 @@ mei_verify_receiver_cert_prepare_km(struct mei_hdcp_data *data, } EXPORT_SYMBOL(mei_verify_receiver_cert_prepare_km);
+/** + * mei_verify_hprime: + * Function to verify AKE_Send_H_prime received + * + * @data : Intel HW specific Data + * @rx_hprime : Pointer for AKE_Send_H_prime + * @hprime_sz : Input buffer size + * + * Returns 0 on Success, <0 on Failure + */ +int mei_verify_hprime(struct mei_hdcp_data *data, + struct hdcp2_ake_send_hprime *rx_hprime) +{ + struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } }; + struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } }; + enum me_hdcp_status status; + struct device *dev; + ssize_t byte; + + if (!data || !rx_hprime) + return -EINVAL; + + /* check for the mei_device enabled or not */ + if (!mei_cldev_active_and_enabled(data->cldev)) + return -ENODEV; + + dev = &data->cldev->dev; + + send_hprime_in.header.api_version = HDCP_API_VERSION; + send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME; + send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS; + send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN; + + send_hprime_in.port.integrated_port_type = data->port_type; + send_hprime_in.port.physical_port = data->port; + + memcpy(send_hprime_in.h_prime, rx_hprime->h_prime, + sizeof(rx_hprime->h_prime)); + + /* Request to ME */ + byte = mei_cldev_send(data->cldev, (u8 *)&send_hprime_in, + sizeof(send_hprime_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 *)&send_hprime_out, + sizeof(send_hprime_out)); + if (byte < 0) { + dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte); + return byte; + } + + status = (enum me_hdcp_status)send_hprime_out.header.status; + if (status != ME_HDCP_STATUS_SUCCESS) { + dev_err(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n", + WIRED_AKE_SEND_HPRIME, status); + return -1; + } + return 0; +} +EXPORT_SYMBOL(mei_verify_hprime); + 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 510a5c1ff1ff..3590e3421134 100644 --- a/include/linux/mei_hdcp.h +++ b/include/linux/mei_hdcp.h @@ -111,6 +111,8 @@ mei_verify_receiver_cert_prepare_km(struct mei_hdcp_data *data, bool *km_stored, struct hdcp2_ake_no_stored_km *ek_pub_km, size_t *msg_sz); +int mei_verify_hprime(struct mei_hdcp_data *data, + struct hdcp2_ake_send_hprime *rx_hprime); #else static inline int mei_hdcp_cldev_get_reference(void *client_data, @@ -140,5 +142,11 @@ mei_verify_receiver_cert_prepare_km(struct mei_hdcp_data *data, { return -ENODEV; } +static inline +int mei_verify_hprime(struct mei_hdcp_data *data, + struct hdcp2_ake_send_hprime *rx_hprime) +{ + return -ENODEV; +} #endif /* defined (CONFIG_INTEL_MEI_HDCP) */ #endif /* defined (_LINUX_MEI_HDCP_H) */