// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2019 Intel Corporation. * * Authors: * Ramalingam C <[email protected]> */ #include <linux/device.h> #include <linux/err.h> #include <linux/gfp.h> #include <linux/export.h> #include <linux/slab.h> #include <linux/firmware.h> #include <drm/display/drm_hdcp_helper.h> #include <drm/drm_sysfs.h> #include <drm/drm_print.h> #include <drm/drm_device.h> #include <drm/drm_property.h> #include <drm/drm_mode_object.h> #include <drm/drm_connector.h> static inline void drm_hdcp_print_ksv(const u8 *ksv) { … } static u32 drm_hdcp_get_revoked_ksv_count(const u8 *buf, u32 vrls_length) { … } static u32 drm_hdcp_get_revoked_ksvs(const u8 *buf, u8 **revoked_ksv_list, u32 vrls_length) { … } static inline u32 get_vrl_length(const u8 *buf) { … } static int drm_hdcp_parse_hdcp1_srm(const u8 *buf, size_t count, u8 **revoked_ksv_list, u32 *revoked_ksv_cnt) { … } static int drm_hdcp_parse_hdcp2_srm(const u8 *buf, size_t count, u8 **revoked_ksv_list, u32 *revoked_ksv_cnt) { … } static inline bool is_srm_version_hdcp1(const u8 *buf) { … } static inline bool is_srm_version_hdcp2(const u8 *buf) { … } static int drm_hdcp_srm_update(const u8 *buf, size_t count, u8 **revoked_ksv_list, u32 *revoked_ksv_cnt) { … } static int drm_hdcp_request_srm(struct drm_device *drm_dev, u8 **revoked_ksv_list, u32 *revoked_ksv_cnt) { … } /** * drm_hdcp_check_ksvs_revoked - Check the revoked status of the IDs * * @drm_dev: drm_device for which HDCP revocation check is requested * @ksvs: List of KSVs (HDCP receiver IDs) * @ksv_count: KSV count passed in through @ksvs * * This function reads the HDCP System renewability Message(SRM Table) * from userspace as a firmware and parses it for the revoked HDCP * KSVs(Receiver IDs) detected by DCP LLC. Once the revoked KSVs are known, * revoked state of the KSVs in the list passed in by display drivers are * decided and response is sent. * * SRM should be presented in the name of "display_hdcp_srm.bin". * * Format of the SRM table, that userspace needs to write into the binary file, * is defined at: * 1. Renewability chapter on 55th page of HDCP 1.4 specification * https://www.digital-cp.com/sites/default/files/specifications/HDCP%20Specification%20Rev1_4_Secure.pdf * 2. Renewability chapter on 63rd page of HDCP 2.2 specification * https://www.digital-cp.com/sites/default/files/specifications/HDCP%20on%20HDMI%20Specification%20Rev2_2_Final1.pdf * * Returns: * Count of the revoked KSVs or -ve error number in case of the failure. */ int drm_hdcp_check_ksvs_revoked(struct drm_device *drm_dev, u8 *ksvs, u32 ksv_count) { … } EXPORT_SYMBOL_GPL(…); static struct drm_prop_enum_list drm_cp_enum_list[] = …; DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list) static struct drm_prop_enum_list drm_hdcp_content_type_enum_list[] = …; DRM_ENUM_NAME_FN(drm_get_hdcp_content_type_name, drm_hdcp_content_type_enum_list) /** * drm_connector_attach_content_protection_property - attach content protection * property * * @connector: connector to attach CP property on. * @hdcp_content_type: is HDCP Content Type property needed for connector * * This is used to add support for content protection on select connectors. * Content Protection is intentionally vague to allow for different underlying * technologies, however it is most implemented by HDCP. * * When hdcp_content_type is true enum property called HDCP Content Type is * created (if it is not already) and attached to the connector. * * This property is used for sending the protected content's stream type * from userspace to kernel on selected connectors. Protected content provider * will decide their type of their content and declare the same to kernel. * * Content type will be used during the HDCP 2.2 authentication. * Content type will be set to &drm_connector_state.hdcp_content_type. * * The content protection will be set to &drm_connector_state.content_protection * * When kernel triggered content protection state change like DESIRED->ENABLED * and ENABLED->DESIRED, will use drm_hdcp_update_content_protection() to update * the content protection state of a connector. * * Returns: * Zero on success, negative errno on failure. */ int drm_connector_attach_content_protection_property( struct drm_connector *connector, bool hdcp_content_type) { … } EXPORT_SYMBOL(…); /** * drm_hdcp_update_content_protection - Updates the content protection state * of a connector * * @connector: drm_connector on which content protection state needs an update * @val: New state of the content protection property * * This function can be used by display drivers, to update the kernel triggered * content protection state changes of a drm_connector such as DESIRED->ENABLED * and ENABLED->DESIRED. No uevent for DESIRED->UNDESIRED or ENABLED->UNDESIRED, * as userspace is triggering such state change and kernel performs it without * fail.This function update the new state of the property into the connector's * state and generate an uevent to notify the userspace. */ void drm_hdcp_update_content_protection(struct drm_connector *connector, u64 val) { … } EXPORT_SYMBOL(…);
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