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misc/mei/hdcp: Store the HDCP Pairing info
Provides Pairing info to ME to store. Pairing is a process to fast track the subsequent authentication with the same HDCP sink. On Success, received HDCP pairing info is stored in non-volatile memory of ME. 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] memcpy for const length. v9: renamed func as mei_hdcp_* [Tomas] Inline function is defined for DDI index [Tomas] v10: K-Doc fix. [Tomas] v11: Rebased. Signed-off-by: Ramalingam C <ramalingam.c@intel.com> Reviewed-by: Uma Shankar <uma.shankar@intel.com> Acked-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-8-git-send-email-ramalingam.c@intel.com
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@ -238,6 +238,64 @@ mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
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return 0;
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}
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/**
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* mei_hdcp_store_pairing_info() - Store pairing info received at ME FW
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* @dev: device corresponding to the mei_cl_device
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* @data: Intel HW specific hdcp data
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* @pairing_info: AKE_Send_Pairing_Info msg input to ME FW
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*
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* Return: 0 on Success, <0 on Failure
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*/
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static int
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mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
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struct hdcp2_ake_send_pairing_info *pairing_info)
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{
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struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
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struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
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struct mei_cl_device *cldev;
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ssize_t byte;
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if (!dev || !data || !pairing_info)
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return -EINVAL;
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cldev = to_mei_cl_device(dev);
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pairing_info_in.header.api_version = HDCP_API_VERSION;
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pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
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pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS;
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pairing_info_in.header.buffer_len =
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WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;
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pairing_info_in.port.integrated_port_type = data->port_type;
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pairing_info_in.port.physical_port = mei_get_ddi_index(data->port);
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memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
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HDCP_2_2_E_KH_KM_LEN);
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byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
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sizeof(pairing_info_in));
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if (byte < 0) {
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dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
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return byte;
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}
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byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
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sizeof(pairing_info_out));
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if (byte < 0) {
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dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
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return byte;
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}
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if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) {
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dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
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WIRED_AKE_SEND_PAIRING_INFO,
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pairing_info_out.header.status);
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return -EIO;
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}
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return 0;
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}
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static const __attribute__((unused))
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struct i915_hdcp_component_ops mei_hdcp_ops = {
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.owner = THIS_MODULE,
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@ -245,7 +303,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
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.verify_receiver_cert_prepare_km =
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mei_hdcp_verify_receiver_cert_prepare_km,
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.verify_hprime = mei_hdcp_verify_hprime,
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.store_pairing_info = NULL,
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.store_pairing_info = mei_hdcp_store_pairing_info,
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.initiate_locality_check = NULL,
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.verify_lprime = NULL,
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.get_session_key = NULL,
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