Request to ME to prepare the encrypted session key.
On Success, ME provides Encrypted session key. Function populates the HDCP2.2 authentication msg SKE_Send_Eks.
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 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 ramalingam.c@intel.com Reviewed-by: Uma Shankar uma.shankar@intel.com --- drivers/misc/mei/hdcp/mei_hdcp.c | 58 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 57 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c index 3d7767d944dc..2be7b6b949c2 100644 --- a/drivers/misc/mei/hdcp/mei_hdcp.c +++ b/drivers/misc/mei/hdcp/mei_hdcp.c @@ -393,6 +393,62 @@ static int mei_verify_lprime(struct device *dev, struct hdcp_port_data *data, return 0; }
+/** + * mei_get_session_key() - Prepare SKE_Send_Eks. + * @dev: device corresponding to the mei_cl_device + * @hdcp_data: Intel HW specific hdcp data + * @ske_data: SKE_Send_Eks msg output from ME FW. + * + * Return: 0 on Success, <0 on Failure + */ +static int mei_get_session_key(struct device *dev, struct hdcp_port_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 } }; + struct mei_cl_device *cldev; + ssize_t byte; + + if (!dev || !data || !ske_data) + return -EINVAL; + + cldev = to_mei_cl_device(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 = (u8)GET_MEI_DDI_INDEX(data->port); + + byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in)); + if (byte < 0) { + dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte); + return byte; + } + + byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out)); + + if (byte < 0) { + dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte); + return byte; + } + + if (get_skey_out.header.status != ME_HDCP_STATUS_SUCCESS) { + dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n", + WIRED_GET_SESSION_KEY, get_skey_out.header.status); + return -EIO; + } + + 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; +} + static __attribute__((unused)) struct i915_hdcp_component_ops mei_hdcp_ops = { .owner = THIS_MODULE, @@ -402,7 +458,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = { .store_pairing_info = mei_store_pairing_info, .initiate_locality_check = mei_initiate_locality_check, .verify_lprime = mei_verify_lprime, - .get_session_key = NULL, + .get_session_key = mei_get_session_key, .repeater_check_flow_prepare_ack = NULL, .verify_mprime = NULL, .enable_hdcp_authentication = NULL,