STRUCT LJCA_ADAPTER(9)

💜 struct ljca_adapter(9) — bestie's guide to the ljca adapter struct 💜

okay so this is the kernel API manual page for struct ljca_adapter, and yes it's a whole vibe. it's the thing that "represent a ljca adapter" — that's the official description and honestly? iconic for being that direct. ✨

🎀 SYNOPSIS 🎀

here's the whole struct, copy-pasted with love, not one field touched:

struct ljca_adapter {
    struct usb_interface *intf;
    struct usb_device *usb_dev;
    struct device *dev;
    unsigned int rx_pipe;
    unsigned int tx_pipe;
    struct urb *rx_urb;
    void *rx_buf;
    unsigned int rx_len;
    u8 *ex_buf;
    u8 ex_buf_len;
    u8 actual_length;
    void *tx_buf;
    u8 tx_buf_len;
    spinlock_t lock;
    struct completion cmd_completion;
    struct mutex mutex;
    struct list_head client_list;
    bool disconnect;
    u32 reset_id;
};

like, she's got range. 💅

🌸 Members 🌸

okay so let's go field by field, because every single one of these matters and i'm not skipping a single one, periodt:

• intf — the usb interface for this ljca adapter 🫶
• usb_dev — the usb device for this ljca adapter, yes they're different things bestie
• dev — the specific device info of the usb interface
• rx_pipe — bulk in pipe for receive data from firmware ✨
• tx_pipe — bulk out pipe for send data to firmware 📤
• rx_urb — urb used for the bulk in pipe
• rx_buf — buffer used to receive command response and event 👀
• rx_len — length of rx buffer
• ex_buf — external buffer to save command response
• ex_buf_len — length of external buffer
• actual_length — actual length of data copied to external buffer (the real one, the one that actually made it 😭)
• tx_buf — buffer used to download command to firmware
• tx_buf_len — length of tx buffer
• lock — spinlock to protect tx_buf and ex_buf 🔒 like a bouncer for two buffers
• cmd_completion — completion object as the command receives ack
• mutex — mutex to avoid command download concurrently (no double-dipping on commands, nope)
• client_list — client device list 📋
• disconnect — usb disconnect ongoing or not (a bool, so like, yes or no, that's it)
• reset_id — used to reset firmware 🔄

🦋 SEE ALSO 🦋

• Kernel file ./drivers/usb/misc/usb-ljca.c — go read the source, iykyk 🧚

lowkey reminder: everything here is just describing the fields — no extra lore, no invented behaviour. what you see is what you get, fr fr. 💖

and that's the whole page bestie 🌈 — this one's from ./drivers/usb/misc, dated October 2026, and it's the struct ljca_adapter(9) page from the Kernel API Manual. go forth and slay those bulk pipes 👑💜