include/drm/drm_audio_component.h

   1 // SPDX-License-Identifier: MIT
   2 // Copyright © 2014 Intel Corporation
   3
   4 #ifndef _DRM_AUDIO_COMPONENT_H_
   5 #define _DRM_AUDIO_COMPONENT_H_
   6
   7 struct drm_audio_component;
   8 struct device;
   9
  10 /**
  11  * struct drm_audio_component_ops - Ops implemented by DRM driver, called by hda driver
  12  */
  13 struct drm_audio_component_ops {
  14         /**
  15          * @owner: drm module to pin down
  16          */
  17         struct module *owner;
  18         /**
  19          * @get_power: get the POWER_DOMAIN_AUDIO power well
  20          *
  21          * Request the power well to be turned on.
  22          *
  23          * Returns a wakeref cookie to be passed back to the corresponding
  24          * call to @put_power.
  25          */
  26         unsigned long (*get_power)(struct device *);
  27         /**
  28          * @put_power: put the POWER_DOMAIN_AUDIO power well
  29          *
  30          * Allow the power well to be turned off.
  31          */
  32         void (*put_power)(struct device *, unsigned long);
  33         /**
  34          * @codec_wake_override: Enable/disable codec wake signal
  35          */
  36         void (*codec_wake_override)(struct device *, bool enable);
  37         /**
  38          * @get_cdclk_freq: Get the Core Display Clock in kHz
  39          */
  40         int (*get_cdclk_freq)(struct device *);
  41         /**
  42          * @sync_audio_rate: set n/cts based on the sample rate
  43          *
  44          * Called from audio driver. After audio driver sets the
  45          * sample rate, it will call this function to set n/cts
  46          */
  47         int (*sync_audio_rate)(struct device *, int port, int pipe, int rate);
  48         /**
  49          * @get_eld: fill the audio state and ELD bytes for the given port
  50          *
  51          * Called from audio driver to get the HDMI/DP audio state of the given
  52          * digital port, and also fetch ELD bytes to the given pointer.
  53          *
  54          * It returns the byte size of the original ELD (not the actually
  55          * copied size), zero for an invalid ELD, or a negative error code.
  56          *
  57          * Note that the returned size may be over @max_bytes.  Then it
  58          * implies that only a part of ELD has been copied to the buffer.
  59          */
  60         int (*get_eld)(struct device *, int port, int pipe, bool *enabled,
  61                        unsigned char *buf, int max_bytes);
  62 };
  63
  64 /**
  65  * struct drm_audio_component_audio_ops - Ops implemented by hda driver, called by DRM driver
  66  */
  67 struct drm_audio_component_audio_ops {
  68         /**
  69          * @audio_ptr: Pointer to be used in call to pin_eld_notify
  70          */
  71         void *audio_ptr;
  72         /**
  73          * @pin_eld_notify: Notify the HDA driver that pin sense and/or ELD information has changed
  74          *
  75          * Called when the DRM driver has set up audio pipeline or has just
  76          * begun to tear it down. This allows the HDA driver to update its
  77          * status accordingly (even when the HDA controller is in power save
  78          * mode).
  79          */
  80         void (*pin_eld_notify)(void *audio_ptr, int port, int pipe);
  81         /**
  82          * @pin2port: Check and convert from pin node to port number
  83          *
  84          * Called by HDA driver to check and convert from the pin widget node
  85          * number to a port number in the graphics side.
  86          */
  87         int (*pin2port)(void *audio_ptr, int pin);
  88         /**
  89          * @master_bind: (Optional) component master bind callback
  90          *
  91          * Called at binding master component, for HDA codec-specific
  92          * handling of dynamic binding.
  93          */
  94         int (*master_bind)(struct device *dev, struct drm_audio_component *);
  95         /**
  96          * @master_unbind: (Optional) component master unbind callback
  97          *
  98          * Called at unbinding master component, for HDA codec-specific
  99          * handling of dynamic unbinding.
 100          */
 101         void (*master_unbind)(struct device *dev, struct drm_audio_component *);
 102 };
 103
 104 /**
 105  * struct drm_audio_component - Used for direct communication between DRM and hda drivers
 106  */
 107 struct drm_audio_component {
 108         /**
 109          * @dev: DRM device, used as parameter for ops
 110          */
 111         struct device *dev;
 112         /**
 113          * @ops: Ops implemented by DRM driver, called by hda driver
 114          */
 115         const struct drm_audio_component_ops *ops;
 116         /**
 117          * @audio_ops: Ops implemented by hda driver, called by DRM driver
 118          */
 119         const struct drm_audio_component_audio_ops *audio_ops;
 120         /**
 121          * @master_bind_complete: completion held during component master binding
 122          */
 123         struct completion master_bind_complete;
 124 };
 125
 126 #endif /* _DRM_AUDIO_COMPONENT_H_ */