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authorRamalingam C <ramalingam.c@intel.com>2019-02-21 23:42:04 +0530
committerDaniel Vetter <daniel.vetter@ffwll.ch>2019-02-25 17:02:32 +0100
commitb491264fcad7a6f38f7ae496c95162c56cc53e2d (patch)
treebf6254f2716dc6cca86952b5385cb0a1befad8e9 /drivers/misc
parent45479b67becd29492b5d53e73cba21d32ad5c391 (diff)
misc/mei/hdcp: Prepare Session Key
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] 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/1550772730-23280-11-git-send-email-ramalingam.c@intel.com
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mei/hdcp/mei_hdcp.c59
1 files changed, 58 insertions, 1 deletions
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 03f8af257ecc..9dc17654ffbc 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -409,6 +409,63 @@ mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
return 0;
}
+/**
+ * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks.
+ * @dev: device corresponding to the mei_cl_device
+ * @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_hdcp_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 = mei_get_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 const __attribute__((unused))
struct i915_hdcp_component_ops mei_hdcp_ops = {
.owner = THIS_MODULE,
@@ -419,7 +476,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
.store_pairing_info = mei_hdcp_store_pairing_info,
.initiate_locality_check = mei_hdcp_initiate_locality_check,
.verify_lprime = mei_hdcp_verify_lprime,
- .get_session_key = NULL,
+ .get_session_key = mei_hdcp_get_session_key,
.repeater_check_flow_prepare_ack = NULL,
.verify_mprime = NULL,
.enable_hdcp_authentication = NULL,