iio_dma_buffer_read(9)

✨ NAME ✨

okay so bestie, this is iio_dma_buffer_read — the DMA buffer read callback 💅 that's it, that's the vibe.

(it lives in the Kernel API Manual, iykyk 👑)

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🌸 SYNOPSIS 🌸

int iio_dma_buffer_read (struct iio_buffer *buffer , size_t n , char
       __user *user_buffer );

like, exactly that, no cap. copy it character for character or the compiler will literally humble you 😭

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🎀 ARGUMENTS 🎀

• buffer — the buffer you're reading from, bestie. that's the source. the main character of this whole situation 💖
• n — number of bytes to read. yes, bytes. count them. be normal about it 🦋
• user_buffer — the userspace buffer where the data gets copied to. the destination. the glow-up location ✨

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🧚 DESCRIPTION 🧚

so here's the tea ☕ — this thing should be used as the read callback for the iio_buffer_access_ops struct when you're dealing with DMA buffers. that's literally its whole job, and it ate 🔥

no extra lore, no secret tricks, that's the assignment. periodt 💅

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💜 SEE ALSO 💜

the kernel file, go read it, it's giving source-of-truth energy:

./drivers/iio/buffer/industrialio-buffer-dma.c

and the whole friend group 🫶:

• iio_dma_buffer_block_done(9)
• iio_dma_buffer_block_list_abort(9)
• iio_dma_buffer_request_update(9)
• iio_dma_buffer_enable(9)
• iio_dma_buffer_disable(9)
• iio_dma_buffer_write(9)
• iio_dma_buffer_usage(9)
• iio_dma_buffer_set_bytes_per_datum(9)
• iio_dma_buffer_set_length(9)
• iio_dma_buffer_init(9)
• iio_dma_buffer_exit(9)
• iio_dma_buffer_release(9)

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and that's the whole page, bestie 🌈 shoutout to ./drivers/iio/buffer for hosting, dated October 2026, brought to you under the iio_dma_buffer_read(9) tag — mwah 💋💖