mma9551_read_version(9)

💖 mma9551_read_version — the kernel API manual, but make it cute ✨

Okay bestie, so this is a page from the Kernel API Manual, and it's all about mma9551_read_version(9). Yes, the (9) means it's a kernel function, we're in the big leagues now 💅

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🌸 NAME 🌸

mma9551_read_version — literally just reads your device's version info. That's it. That's the whole job. Slay.

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🎀 SYNOPSIS 🎀

int mma9551_read_version (struct i2c_client *client );

One argument, one return value, zero drama. Iconic behavior honestly.

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🦋 ARGUMENTS 🦋

• client — the I2C client. That's your device handle, bestie, it's how the function knows which mma9551 it's talking to 🫶

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✨ DESCRIPTION ✨

So what does it actually do? It reads the version information and prints out the device id and the firmware version. That's the whole vibe check — you call it, it goes "here's what I am", and it prints that info for you 💫

🚨 Locking note, and this one's important, no cap: this function must be called with the device lock held. The locking is not handled inside the function — like, at all. Callers should make sure they serialize access to the HW themselves. So if you skip the lock, that's on you, and the hardware will not be happy with you 😭 Lock it up first, periodt.

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⭐ RETURN ⭐

• 0 on success 🎉
• a negative value on failure 💀

That's the classic kernel pattern and honestly it ate.

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🌈 SEE ALSO 🌈

This function lives in the kernel file ./drivers/iio/accel/mma9551_core.c — go say hi to it there 👑

And here's the whole friend group, all the siblings and cousins of this function:

• mma9551_read_config_byte(9)
• mma9551_write_config_byte(9)
• mma9551_read_status_byte(9)
• mma9551_read_config_word(9)
• mma9551_write_config_word(9)
• mma9551_read_status_word(9)
• mma9551_read_config_words(9)
• mma9551_read_status_words(9)
• mma9551_write_config_words(9)
• mma9551_update_config_bits(9)
• mma9551_gpio_config(9)
• mma9551_set_device_state(9)
• mma9551_set_power_state(9)
• mma9551_sleep(9)
• mma9551_read_accel_chan(9)
• mma9551_read_accel_scale(9)
• mma9551_app_reset(9)

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🧚 Sign-off 🧚

This lil page comes from ./drivers/iio/accel and it's dated October 2026 — mark your calendars bestie 🍓 And that's the whole manual page for mma9551_read_version(9), delivered with love, hyperfixation, and correct locking discipline. Go hold that device lock. I'm obsessed with you 💜