Request to ME to prepare the encrypted session key.
On Success, ME provides Encrypted session key. Functions populates the HDCP2.2 authentication msg SKE_Send_Eks.
v2: Rebased.
Signed-off-by: Ramalingam C ramalingam.c@intel.com --- drivers/misc/mei/hdcp/mei_hdcp.c | 67 ++++++++++++++++++++++++++++++++++++++++ include/linux/mei_hdcp.h | 8 +++++ 2 files changed, 75 insertions(+)
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c index c3c8b9a28498..fbb88a56e10c 100644 --- a/drivers/misc/mei/hdcp/mei_hdcp.c +++ b/drivers/misc/mei/hdcp/mei_hdcp.c @@ -468,6 +468,73 @@ int mei_verify_lprime(struct mei_hdcp_data *data, } EXPORT_SYMBOL(mei_verify_lprime);
+/** + * mei_get_session_key: + * Function to prepare SKE_Send_Eks. + * + * @data : Intel HW specific Data + * @ske_data : Pointer for SKE_Send_Eks. + * + * Returns 0 on Success, <0 on Failure + */ +int mei_get_session_key(struct mei_hdcp_data *data, + struct hdcp2_ske_send_eks *ske_data) +{ + struct wired_cmd_get_session_key_in get_skey_in = { { 0 } }; + struct wired_cmd_get_session_key_out get_skey_out = { { 0 } }; + enum me_hdcp_status status; + struct device *dev; + ssize_t byte; + + if (!data || !ske_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; + + get_skey_in.header.api_version = HDCP_API_VERSION; + get_skey_in.header.command_id = WIRED_GET_SESSION_KEY; + get_skey_in.header.status = ME_HDCP_STATUS_SUCCESS; + get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN; + + get_skey_in.port.integrated_port_type = data->port_type; + get_skey_in.port.physical_port = data->port; + + /* Request to ME */ + byte = mei_cldev_send(data->cldev, (u8 *)&get_skey_in, + sizeof(get_skey_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 *)&get_skey_out, + sizeof(get_skey_out)); + + if (byte < 0) { + dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte); + return byte; + } + + status = (enum me_hdcp_status)get_skey_out.header.status; + if (status != ME_HDCP_STATUS_SUCCESS) { + dev_err(dev, "ME cmd 0x%08X failed. status: 0x%X\n", + WIRED_GET_SESSION_KEY, status); + return -1; + } + + ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS; + memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks, + HDCP_2_2_E_DKEY_KS_LEN); + memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN); + return 0; +} +EXPORT_SYMBOL(mei_get_session_key); + 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 d8c2b440cd81..193f23ba8fbc 100644 --- a/include/linux/mei_hdcp.h +++ b/include/linux/mei_hdcp.h @@ -119,6 +119,8 @@ int mei_initiate_locality_check(struct mei_hdcp_data *data, struct hdcp2_lc_init *lc_init_data); int mei_verify_lprime(struct mei_hdcp_data *data, struct hdcp2_lc_send_lprime *rx_lprime); +int mei_get_session_key(struct mei_hdcp_data *data, + struct hdcp2_ske_send_eks *ske_data); #else static inline int mei_hdcp_cldev_get_reference(void *client_data, @@ -172,5 +174,11 @@ int mei_verify_lprime(struct mei_hdcp_data *data, { return -ENODEV; } +static inline +int mei_get_session_key(struct mei_hdcp_data *data, + struct hdcp2_ske_send_eks *ske_data) +{ + return -ENODEV; +} #endif /* defined (CONFIG_INTEL_MEI_HDCP) */ #endif /* defined (_LINUX_MEI_HDCP_H) */