[PATCH 14/43] misc/mei/hdcp: Store the HDCP Pairing info

Ramalingam C
2018-02-14T14:20:20Z

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.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
drivers/misc/mei/mei_hdcp.c | 66 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/mei_hdcp.h | 8 ++++++
2 files changed, 74 insertions(+)

diff --git a/drivers/misc/mei/mei_hdcp.c b/drivers/misc/mei/mei_hdcp.c
index 7977038e0642..d243db70a7de 100644
--- a/drivers/misc/mei/mei_hdcp.c
+++ b/drivers/misc/mei/mei_hdcp.c
@@ -273,6 +273,72 @@ int mei_verify_hprime(struct mei_hdcp_data *data,
}
EXPORT_SYMBOL(mei_verify_hprime);

+/**
+ * mei_store_pairing_info:
+ * Function to store pairing info received from panel
+ *
+ * @data : Intel HW specific Data
+ * @pairing_info : Pointer for AKE_Send_Pairing_Info
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+
+int mei_store_pairing_info(struct mei_hdcp_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 } };
+ enum me_status status = ME_HDCP_STATUS_UNKNOWN_ERROR;
+ struct device *dev;
+ ssize_t byte;
+
+ if (!data || !pairing_info)
+ return -EINVAL;
+
+ /* check for the mei_device enabled or not */
+ if (!mei_cldev_active_and_enabled(data->cldev))
+ return -ENODEV;
+
+ dev = &data->cldev->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 = data->port;
+
+ memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
+ sizeof(pairing_info_in.e_kh_km));
+
+ /* Request to ME */
+ byte = mei_cldev_send(data->cldev, (u8 *)&pairing_info_in,
+ sizeof(pairing_info_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 *)&pairing_info_out,
+ sizeof(pairing_info_out));
+ if (byte < 0) {
+ dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte);
+ return byte;
+ }
+
+ status = (enum me_status)pairing_info_out.header.status;
+ if (status != ME_HDCP_STATUS_SUCCESS) {
+ dev_err(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
+ WIRED_AKE_SEND_PAIRING_INFO, status);
+ return -1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(mei_store_pairing_info);
+
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 3590e3421134..449ac3af4d53 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -113,6 +113,8 @@ mei_verify_receiver_cert_prepare_km(struct mei_hdcp_data *data,
size_t *msg_sz);
int mei_verify_hprime(struct mei_hdcp_data *data,
struct hdcp2_ake_send_hprime *rx_hprime);
+int mei_store_pairing_info(struct mei_hdcp_data *data,
+ struct hdcp2_ake_send_pairing_info *pairing_info);
#else
static inline
int mei_hdcp_cldev_get_reference(void *client_data,
@@ -148,5 +150,11 @@ int mei_verify_hprime(struct mei_hdcp_data *data,
{
return -ENODEV;
}
+static inline
+int mei_store_pairing_info(struct mei_hdcp_data *data,
+ struct hdcp2_ake_send_pairing_info *pairing_info)
+{
+ return -ENODEV;
+}
#endif /* defined (CONFIG_INTEL_MEI_HDCP) */
#endif /* defined (_LINUX_MEI_HDCP_H) */