ljca_transfer(9)

💖 ljca_transfer(9) 💖

okay so bestie, welcome to the Kernel API Manual entry for ljca_transfer(9) — yes that's the whole title, this page is literally about one function and she's a whole vibe. buckle up 🎀

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✨ NAME ✨

ljca_transfer — issue a LJCA command and wait for a response 🫶

like, you send a command, and then you wait. patient queen behavior. no cap. ⏳

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🌸 SYNOPSIS 🌸

int ljca_transfer (struct ljca_client *client , u8 cmd , const u8 *obuf
, u8 obuf_len , u8 *ibuf , u8 ibuf_len );

that's the signature, copy it exactly diva, don't freestyle it 💅

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🦋 ARGUMENTS 🦋

• client — the ljca client device 💖 the main character of this whole operation ngl
• cmd — the command that's getting sent to the device, periodt ✨
• obuf — the buffer you're sending over to the device. it can be NULL if you don't need to transmit any data with this command, super chill of you honestly 🙈
• obuf_len — how big that outgoing buffer is. heads up bestie: it should be 0 when obuf is NULL — them's the rules ⚠️
• ibuf — any data that comes back with the response gets copied in here 🎀 it can be NULL if you don't care about the response data, no pressure, live your truth
• ibuf_len — must be initialized to the input buffer size — like actually initialize it, don't leave it unset, that's not the vibe fr fr 💀

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⭐ RETURN ⭐

on success you get the actual length of the response data 🔥 (a real number, not vibes). on errors? you get a negative value 😭 so always check, bestie, always check.

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🌈 SEE ALSO 🌈

kernel file ./include/linux/usb/ljca.h — that's the one, iykyk 👑

and the whole friend group:

• ljca_event_cb_t(9)
• struct ljca_client(9)
• struct ljca_gpio_info(9)
• struct ljca_i2c_info(9)
• struct ljca_spi_info(9)
• ljca_register_event_cb(9)
• ljca_unregister_event_cb(9)
• ljca_transfer_noack(9)

go read them all, they ate 💅✨

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ok that's the whole page!! she lives in ./include/linux/usb and this version is dated October 2026 — mwah, love u, bye 🧚💜🍓

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🧚 source: ./include/linux/usb · ljca_transfer(9) · October 2026 — slay, go transfer some commands responsibly 💖