STRUCT SENSOR_HUB_DATA(9)

💖 struct sensor_hub_data(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one's from the struct sensor_hub_data(9) page and it's literally all about the vibes of one single HID hub device's private data. think of it as the group chat that holds all the state for a hub. no cap. 🫶

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✨ NAME ✨

struct sensor_hub_data — hold a instance data for a HID hub device

like, it's the little container where the instance data for a HID hub device lives. main character storage unit energy. 👑

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🌸 SYNOPSIS 🌸

struct sensor_hub_data {
    struct mutex mutex;
    spinlock_t lock;
    struct list_head dyn_callback_list;
    spinlock_t dyn_callback_lock;
    struct mfd_cell *hid_sensor_hub_client_devs;
    int hid_sensor_client_cnt;
    int ref_cnt;
 };

that's the whole struct, exactly as it is — do not come for me about the spacing, I copied it character for character. 💅

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🦋 Members 🦋

get comfy, we're going through every single field, one by one, and yes I mean all of them:

• mutex — a mutex whose whole job is to serialize synchronous requests. one at a time please, we're not doing chaos in here. 🔒
• lock — a spin lock that protects the pending request structure. it's giving bodyguard for pending requests. 🛡️
• dyn_callback_list — holds the callback function. that's it, that's the whole thing. the callbacks live here. ✨
• dyn_callback_lock — a spin lock to protect the callback list. someone's gotta guard the list, and it's her. 💅
• hid_sensor_hub_client_devs — stores all the MFD cells for a hub instance. like a little shoebox full of MFD cells, one hub instance at a time. 🎀
• hid_sensor_client_cnt — the number of MFD cells, which is also (no of sensors attached). so if you ever wondered how many sensors are attached, it's this number. 🍓
• ref_cnt — the number of MFD clients that have opened this device. it's a headcount, basically. every client that opens the device increments the vibe. 🧚

ngl if you touch this struct you should know what every single one of these fields is doing. it's kernel code bestie, not a sandbox. 🔥

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/hid/hid-sensor-hub.c struct
• hid_sensor_hub_callbacks_list(9) — go read this one too, iykyk 💜

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⭐ aaand that's the page! cute little sign-off for you: this gem lives over in ./drivers/hid, and the page is dated October 2026. slay, go read the kernel source, mwah 💖🎀🦋