STRUCT FM801(9)

💖 NAME 💖

okay so bestie, this is the struct fm801(9) page from the Kernel API Manual — it's literally the struct that describes the FM801 chip. Main character struct energy, no cap. 💅

✨ SYNOPSIS ✨

here's the whole shape of it, copied exactly because we do not mess with code:

       struct fm801 {
           struct device *dev;
           int irq;
           unsigned long port;
           unsigned int multichannel: 1, secondary: 1;
           unsigned char secondary_addr;
           unsigned int tea575x_tuner;
           unsigned short ply_ctrl;
           unsigned short cap_ctrl;
           unsigned long ply_buffer;
           unsigned int ply_buf;
           unsigned int ply_count;
           unsigned int ply_size;
           unsigned int ply_pos;
           unsigned long cap_buffer;
           unsigned int cap_buf;
           unsigned int cap_count;
           unsigned int cap_size;
           unsigned int cap_pos;
           struct snd_ac97_bus *ac97_bus;
           struct snd_ac97 *ac97;
           struct snd_ac97 *ac97_sec;
           struct snd_card *card;
           struct snd_pcm *pcm;
           struct snd_rawmidi *rmidi;
           struct snd_pcm_substream *playback_substream;
           struct snd_pcm_substream *capture_substream;
           unsigned int p_dma_size;
           unsigned int c_dma_size;
           spinlock_t reg_lock;
           struct snd_info_entry *proc_entry;
         #ifdef CONFIG_SND_FM801_TEA575X_BOOL;
           struct v4l2_device v4l2_dev;
           struct snd_tea575x tea;
         #endif;
           u16 saved_regs[0x20];
        };

🎀 Members 🎀

every member, in order, zero skips — we're doing the full tour, bestie 🫶

• dev — the device for this chio (the page says chio, and we are being faithful to it 🙈)
• irq — the irq number
• port — the I/O port number
• multichannel — multichannel support
• secondary — secondary codec
• secondary_addr — address of the secondary codec
• tea575x_tuner — tuner access method & flags
• ply_ctrl — playback control
• cap_ctrl — capture control
• ply_buffer — playback buffer
• ply_buf — playback buffer index
• ply_count — playback buffer count
• ply_size — playback buffer size
• ply_pos — playback position
• cap_buffer — capture buffer
• cap_buf — capture buffer index
• cap_count — capture buffer count
• cap_size — capture buffer size
• cap_pos — capture position
• ac97_bus — ac97 bus handle
• ac97 — ac97 handle
• ac97_sec — ac97 secondary handle
• card — ALSA card
• pcm — PCM devices
• rmidi — rmidi device
• playback_substream — substream for playback
• capture_substream — substream for capture
• p_dma_size — playback DMA size
• c_dma_size — capture DMA size
• reg_lock — lock
• proc_entry — /proc entry
• v4l2_dev — v4l2 device
• tea — tea575a structure
• saved_regs — context saved during suspend

🌈 SEE ALSO 🌈

• Kernel file ./sound/pci/fm801.c

and that's the whole vibe, bestie 🫶 — this page comes from source path ./sound/pci, it's dated October 2026, and it's the struct fm801(9) manual page. Slay and read your kernel docs 💖✨