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Commit 6a1a00a3 authored by Ramalingam C's avatar Ramalingam C Committed by Daniel Vetter
Browse files

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: default avatarRamalingam C <ramalingam.c@intel.com>
Reviewed-by: default avatarUma Shankar <uma.shankar@intel.com>
Acked-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-8-git-send-email-ramalingam.c@intel.com
parent a7dcbed2

drivers/misc/mei/hdcp/mei_hdcp.c

+59 −1
Original line number Diff line number Diff line
@@ -238,6 +238,64 @@ mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data, 
	return 0;

}



/**

 * mei_hdcp_store_pairing_info() - Store pairing info received at ME FW

 * @dev: device corresponding to the mei_cl_device

 * @data: Intel HW specific hdcp data

 * @pairing_info: AKE_Send_Pairing_Info msg input to ME FW

 *

 * Return: 0 on Success, <0 on Failure

 */

static int

mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,

			    struct hdcp2_ake_send_pairing_info *pairing_info)

{

	struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };

	struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };

	struct mei_cl_device *cldev;

	ssize_t byte;



	if (!dev || !data || !pairing_info)

		return -EINVAL;



	cldev = to_mei_cl_device(dev);



	pairing_info_in.header.api_version = HDCP_API_VERSION;

	pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;

	pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS;

	pairing_info_in.header.buffer_len =

					WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;



	pairing_info_in.port.integrated_port_type = data->port_type;

	pairing_info_in.port.physical_port = mei_get_ddi_index(data->port);



	memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,

	       HDCP_2_2_E_KH_KM_LEN);



	byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,

			      sizeof(pairing_info_in));

	if (byte < 0) {

		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);

		return byte;

	}



	byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,

			      sizeof(pairing_info_out));

	if (byte < 0) {

		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);

		return byte;

	}



	if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) {

		dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",

			WIRED_AKE_SEND_PAIRING_INFO,

			pairing_info_out.header.status);

		return -EIO;

	}



	return 0;

}



static const __attribute__((unused))

struct i915_hdcp_component_ops mei_hdcp_ops = {

	.owner = THIS_MODULE,
@@ -245,7 +303,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = { 
	.verify_receiver_cert_prepare_km =

				mei_hdcp_verify_receiver_cert_prepare_km,

	.verify_hprime = mei_hdcp_verify_hprime,

	.store_pairing_info = NULL,

	.store_pairing_info = mei_hdcp_store_pairing_info,

	.initiate_locality_check = NULL,

	.verify_lprime = NULL,

	.get_session_key = NULL,