STRUCT HDA_DAI_WIDGET_DMA_OPS(9)

✨ struct hda_dai_widget_dma_ops — NAME ✨

okay so, bestie, this is struct hda_dai_widget_dma_ops, and it's the DAI DMA ops struct 💅 — and here's the vibe: it's optional by default unless you specify otherwise. That's it, that's the whole personality. From the Kernel API Manual, obviously 👑

🎀 SYNOPSIS 🎀

no cap, here's the whole struct, character for character, don't @ me:

struct hda_dai_widget_dma_ops {
    struct hdac_ext_stream *(*get_hext_stream)(struct snd_sof_dev *sdev,
struct snd_soc_dai *cpu_dai, struct snd_pcm_substream *substream);
    struct hdac_ext_stream *(*assign_hext_stream)(struct snd_sof_dev
*sdev, struct snd_soc_dai *cpu_dai, struct snd_pcm_substream *substream,
struct hdac_ext_link *hlink);
    void (*release_hext_stream)(struct snd_sof_dev *sdev, struct
snd_soc_dai *cpu_dai, struct snd_pcm_substream *substream);
    void (*setup_hext_stream)(struct snd_sof_dev *sdev, struct
hdac_ext_stream *hext_stream, unsigned int format_val);
    void (*reset_hext_stream)(struct snd_sof_dev *sdev, struct
hdac_ext_stream *hext_sream);
    int (*pre_trigger)(struct snd_sof_dev *sdev, struct snd_soc_dai
*cpu_dai, struct snd_pcm_substream *substream, int cmd);
    int (*trigger)(struct snd_sof_dev *sdev, struct snd_soc_dai
*cpu_dai, struct snd_pcm_substream *substream, int cmd);
    int (*post_trigger)(struct snd_sof_dev *sdev, struct snd_soc_dai
*cpu_dai, struct snd_pcm_substream *substream, int cmd);
    void (*codec_dai_set_stream)(struct snd_sof_dev *sdev, struct
snd_pcm_substream *substream, struct hdac_stream *hstream);
    unsigned int (*calc_stream_format)(struct snd_sof_dev *sdev, struct
snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
    struct hdac_ext_link * (*get_hlink)(struct snd_sof_dev *sdev, struct
snd_pcm_substream *substream);
 };

(yes, hext_sream in reset_hext_stream is spelled exactly like that in the source — not me, I would never 🙈 — and yes, get_hlink has that lil space before the (. copying faithfully is the whole assignment 🫶)

💖 Members 💖

okay so let's go member by member, this is the main character section:

• get_hext_stream — ngl this one is mandatory, bestie. it's the function pointer that grabs the saved pointer to struct hdac_ext_stream. you literally cannot skip it. periodt.
• assign_hext_stream — function pointer that assigns a hdac_ext_stream. lowkey essential to the plot.
• release_hext_stream — function pointer that releases the hdac_ext_stream. letting it go, giving it space to heal 🌸
• setup_hext_stream — function pointer for hdac_ext_stream setup. the getting-ready-for-the-party part ✨
• reset_hext_stream — function pointer for hdac_ext_stream reset. hitting refresh, we love a fresh start 🦋
• pre_trigger — function pointer for DAI DMA pre-trigger actions. the before energy.
• trigger — function pointer for DAI DMA trigger actions. the main event, the moment, the slay 🔥
• post_trigger — function pointer for DAI DMA post-trigger actions. the after energy, the debrief.
• codec_dai_set_stream — function pointer that sets the codec-side stream information. codec side said "I also have lore" 💀
• calc_stream_format — function pointer that determines the stream format from hw_params, and for HDaudio codec DAI it does it from the .sig bits. the math girlie of the group 🧮
• get_hlink — mandatory function pointer ⌛️ no skipping! it retrieves the hlink, mainly to program LOSIDV for legacy HDaudio links, or to program HDaudio Extended Link registers. iconic behavior, tbh 👑

🦋 SEE ALSO 🦋

• Kernel file ./sound/soc/sof/intel/hda.h — go read it, iykyk 💜

fr fr: everything this struct does is optional by default unless specified otherwise — except get_hext_stream and get_hlink, those two are mandatory and they know it 👀

and that's the whole page, bestie!! 🎀 source is ./sound/soc/sof/intel, dated October 2026, from the Kernel API Manual — mwah, go forth and program those Extended Link registers 💅✨🌈