mma9551_set_device_state(9)

💅 mma9551_set_device_state(9) — the Kernel API Manual glow-up ✨

okay bestie, so this is a page from the Kernel API Manual and it's literally about setting the HW power mode on your mma9551 chip. no cap, it's giving "tiny function, big responsibility" energy 🎀

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✨ NAME ✨

mma9551_set_device_state — sets HW power mode 👑

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🌸 SYNOPSIS 🌸

int mma9551_set_device_state (struct i2c_client *client , bool enable );

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🦋 ARGUMENTS 🦋

• client — the I2C client, obvi 💖
• enable — pass true to power on the device, or false to make the device enter sleep 😴

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🎀 DESCRIPTION 🎀

So basically this function sets power on/off for the device using the Sleep/Wake Application. iconic behavior fr fr.

When enable is true, it powers on the chip and enables doze mode 🔥

When enable is false, it enters sleep mode — and yes, the device remains in the lowest-power mode 💤

🚨 Locking note, bestie, pay attention: this function must be called with the device lock held. Locking is not handled inside the function. Callers should ensure they serialize access to the HW. like pls don't skip this part 😭

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🌈 RETURN 🌈

• 0 on success 💖
• negative value on failure 💀

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🫶 SEE ALSO 🫶

Kernel file ./drivers/iio/accel/mma9551_core.c

• 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_read_version(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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and that's the whole vibe check, bestie 💅 this page lives in ./drivers/iio/accel, dated October 2026, and it's literally mma9551_set_device_state(9) — periodt. go serialize that HW access and slay ✨🦋💜