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8b1a8f8b20
Add generic CEC helpers to be used by HDMI drivers. Both notifier and and adapter are supported for registration. Once registered, the driver can call common set of functions to update physical address, to invalidate it or to unregister CEC data. Unlike drm_connector_cec_funcs (which provides interface common to all implementations, including, but not limited to the CEC adapter, CEC notifier, CEC pin-based adapter, etc) the struct drm_connector_hdmi_cec_adapter_ops provides callbacks specific to the CEC adapter implementations. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Maxime Ripard <mripard@kernel.org> Link: https://lore.kernel.org/r/20250517-drm-hdmi-connector-cec-v6-5-35651db6f19b@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* SPDX-License-Identifier: MIT */
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#ifndef DRM_DISPLAY_HDMI_CEC_HELPER
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#define DRM_DISPLAY_HDMI_CEC_HELPER
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#include <linux/types.h>
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struct drm_connector;
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struct cec_msg;
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struct device;
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struct drm_connector_hdmi_cec_funcs {
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/**
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* @init: perform hardware-specific initialization before registering the CEC adapter
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*/
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int (*init)(struct drm_connector *connector);
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/**
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* @uninit: perform hardware-specific teardown for the CEC adapter
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*/
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void (*uninit)(struct drm_connector *connector);
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/**
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* @enable: enable or disable CEC adapter
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*/
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int (*enable)(struct drm_connector *connector, bool enable);
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/**
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* @log_addr: set adapter's logical address, can be called multiple
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* times if adapter supports several LAs
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*/
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int (*log_addr)(struct drm_connector *connector, u8 logical_addr);
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/**
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* @transmit: start transmission of the specified CEC message
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*/
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int (*transmit)(struct drm_connector *connector, u8 attempts,
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u32 signal_free_time, struct cec_msg *msg);
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};
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int drmm_connector_hdmi_cec_register(struct drm_connector *connector,
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const struct drm_connector_hdmi_cec_funcs *funcs,
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const char *name,
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u8 available_las,
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struct device *dev);
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void drm_connector_hdmi_cec_received_msg(struct drm_connector *connector,
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struct cec_msg *msg);
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void drm_connector_hdmi_cec_transmit_done(struct drm_connector *connector,
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u8 status,
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u8 arb_lost_cnt, u8 nack_cnt,
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u8 low_drive_cnt, u8 error_cnt);
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void drm_connector_hdmi_cec_transmit_attempt_done(struct drm_connector *connector,
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u8 status);
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#if IS_ENABLED(CONFIG_DRM_DISPLAY_HDMI_CEC_NOTIFIER_HELPER)
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int drmm_connector_hdmi_cec_notifier_register(struct drm_connector *connector,
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const char *port_name,
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struct device *dev);
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#else
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static inline int drmm_connector_hdmi_cec_notifier_register(struct drm_connector *connector,
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const char *port_name,
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struct device *dev)
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{
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return 0;
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}
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#endif
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#endif
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