[PATCH 15/43] misc/mei/hdcp: Initiate Locality check

Ramalingam C
2018-02-14T14:20:21Z

Requests ME to start the second stage of HDCP2.2 authentication,
called Locality Check.

On Success, ME FW will provide LC_Init message to send to hdcp sink.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
drivers/misc/mei/mei_hdcp.c | 64 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/mei_hdcp.h | 8 ++++++
2 files changed, 72 insertions(+)

diff --git a/drivers/misc/mei/mei_hdcp.c b/drivers/misc/mei/mei_hdcp.c
index d243db70a7de..5f0c56a1e51b 100644
--- a/drivers/misc/mei/mei_hdcp.c
+++ b/drivers/misc/mei/mei_hdcp.c
@@ -339,6 +339,70 @@ int mei_store_pairing_info(struct mei_hdcp_data *data,
}
EXPORT_SYMBOL(mei_store_pairing_info);

+/**
+ * mei_initiate_locality_check:
+ * Function to prepare LC_Init.
+ *
+ * @data : Intel HW specific Data
+ * @hdcp2_lc_init : Pointer for storing LC_Init
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+int mei_initiate_locality_check(struct mei_hdcp_data *data,
+ struct hdcp2_lc_init *lc_init_data)
+{
+ struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
+ struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
+ enum me_status status;
+ struct device *dev;
+ ssize_t byte;
+
+ if (!data || !lc_init_data)
+ return -EINVAL;
+
+ /* check for the mei_device enabled or not */
+ if (!mei_cldev_active_and_enabled(data->cldev))
+ return -ENODEV;
+
+ dev = &data->cldev->dev;
+
+ lc_init_in.header.api_version = HDCP_API_VERSION;
+ lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
+ lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
+ lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;
+
+ lc_init_in.port.integrated_port_type = data->port_type;
+ lc_init_in.port.physical_port = data->port;
+
+ /* Request to ME */
+ byte = mei_cldev_send(data->cldev, (u8 *)&lc_init_in,
+ sizeof(lc_init_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 *)&lc_init_out,
+ sizeof(lc_init_out));
+ if (byte < 0) {
+ dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte);
+ return byte;
+ }
+
+ status = (enum me_status)lc_init_out.header.status;
+ if (status != ME_HDCP_STATUS_SUCCESS) {
+ dev_err(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
+ WIRED_INIT_LOCALITY_CHECK, status);
+ return -1;
+ }
+
+ lc_init_data->msg_id = LC_INIT;
+ memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_RN_LEN);
+ return 0;
+}
+EXPORT_SYMBOL(mei_initiate_locality_check);
+
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 449ac3af4d53..fd8a26dddacb 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -115,6 +115,8 @@ 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);
+int mei_initiate_locality_check(struct mei_hdcp_data *data,
+ struct hdcp2_lc_init *lc_init_data);
#else
static inline
int mei_hdcp_cldev_get_reference(void *client_data,
@@ -156,5 +158,11 @@ int mei_store_pairing_info(struct mei_hdcp_data *data,
{
return -ENODEV;
}
+static inline
+int mei_initiate_locality_check(struct mei_hdcp_data *data,
+ struct hdcp2_lc_init *lc_init_data)
+{
+ return -ENODEV;
+}
#endif /* defined (CONFIG_INTEL_MEI_HDCP) */
#endif /* defined (_LINUX_MEI_HDCP_H) */