STRUCT ISST_IF_CMD_CB(9)

💅 struct isst_if_cmd_cb(9)

okay so bestie, welcome to the Kernel API Manual ✨ this page is literally about struct isst_if_cmd_cb — and yes, the whole personality of this thing is: it's the glow-up registration form for an IOCTL handler 🎀

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🌸 NAME 🌸

struct isst_if_cmd_cb — the struct you use to register an IOCTL handler, no cap 💖

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✨ SYNOPSIS ✨

struct isst_if_cmd_cb {
    int registered;
    int cmd_size;
    int offset;
    int api_version;
    struct module *owner;
    long (*cmd_callback)(u8 *ptr, int *write_only, int resume);
    long (*def_ioctl)(struct file *file, unsigned int cmd, unsigned long
arg);
 };

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🦋 Members 🦋

• registered — this one is the common code's little diary entry, it stores the registry. Caller does not need to touch this field, fr fr hands off 🙈
• cmd_size — the size of the individual command inside the IOCTL 📏
• offset — offset to the first valid member in the command structure. Basically it's the offset where the command actually starts, right after the command count field 🎯
• api_version — the API version supported for this target. It's 0 if there isn't one 🤷‍♀️
• owner — the registered module owner 👑
• cmd_callback — the callback function that handles the IOCTL 💅 it gets the command pointer with the data for the command. There's this pointer called write_only, and when it's set, the response will not be copied back to the user ioctl buffer (noted, bestie 🫶). The resume argument can be used to avoid storing the command for replay during system resume 😴
• def_ioctl — the default IOCTL handler callback, for when there's no match in the existing list of IOCTLs handled by the common handler 🧚 it's giving backup plan energy

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🔥 Description 🔥

So this structure registers a handler for IOCTL — that's the whole vibe ✨ To avoid code duplication (iconic, honestly), the common code handles all the IOCTL command read/write, including handling multiple commands in a single IOCTL 💀 The caller literally just needs to execute a command via the registered callback, and that's it. Periodt. 🩷

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🌈 SEE ALSO 🌈

• Kernel file: ./drivers/platform/x86/intel/speed_select_if/isst_if_common.h ⭐

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💖 reminder bestie: this is the Kernel API Manual version of the page, so the struct fields and paths above are literal — copy them exact, don't get creative with the code, only with your energy 💅

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mwah, that's the page 🎀 brought to you by the ./drivers/platform/x86/intel/s... source, dated October 2026 — go forth and register those IOCTL handlers, you absolute main character 👑💜