STRUCT MCP3564_STATE(9)

✨ struct mcp3564_state(9) ✨

okay so this is a page from the Kernel API Manual, and we're talking about struct mcp3564_state — literally the working data for a ADC device 💅 that's it, that's the whole vibe. she's the little state box that keeps everything the driver needs to remember, and bestie, she holds a LOT. 🎀

🌸 SYNOPSIS 🌸

struct mcp3564_state {
    const struct mcp3564_chip_info  *chip_info;
    struct spi_device               *spi;
    unsigned short                  vref_mv;
    struct mutex                    lock;
    u8 dev_addr;
    enum mcp3564_oversampling       oversampling;
    unsigned int                    hwgain;
    unsigned int                    scale_tbls[MCP3564_MAX_PGA][2];
    int calib_bias;
    int calib_scale;
    unsigned int                    current_boost_mode;
    enum mcp3564_burnout            burnout_mode;
    bool auto_zeroing_mux;
    bool auto_zeroing_ref;
    bool have_vref;
    const char                      *labels[MCP3564_MAX_CHANNELS];
};

like, look at her. she's got layers. she's got range. 🦋

💖 Members 💖

• chip_info — chip specific data ✨ the deets on which chip we're dealing with, no cap.
• spi — the SPI device structure, aka the actual SPI device hanging out in here.
• vref_mv — voltage reference value, and it's in millivolts so watch your units bestie 😭.
• lock — synchronize access to driver's state members. it's a struct mutex, it's giving bouncer-at-the-club energy, nobody touches the state without going through her 🔒.
• dev_addr — hardware device address. a u8, so tiny but iconic.
• oversampling — the index inside oversampling list of the ADC. an enum mcp3564_oversampling, lowkey just a pointer into a list 🫶.
• hwgain — the index inside hardware gain list of the ADC. unsigned int, same deal, different list 💅.
• scale_tbls — table with precalculated scale. it's scale_tbls[MCP3564_MAX_PGA][2] and yes the precalculation is doing the most so you don't have to 🔥.
• calib_bias — calibration bias value, a comfy little int.
• calib_scale — calibration scale value, also an int, also comfy.
• current_boost_mode — the index inside current boost list of the ADC. unsigned int, index-into-a-list situation, we love consistency ✨.
• burnout_mode — the index inside current bias list of the ADC. it's an enum mcp3564_burnout. (yes it's called burnout mode, no it's not about finals week 💀)
• auto_zeroing_mux — set if ADC auto-zeroing algorithm is enabled. a bool, so she's either on or off, periodt.
• auto_zeroing_ref — set if ADC auto-Zeroing Reference Buffer Setting is enabled. also a bool. also on or off. the auto-zeroing is thriving in this struct 🌈.
• have_vref — does the ADC have an internal voltage reference? it's a bool, so it's giving yes/no main character energy 👑.
• labels — table with channels labels. const char *labels[MCP3564_MAX_CHANNELS], one label per channel, all cute and accounted for 🎀.

🦋 SEE ALSO 🦋

• Kernel file ./drivers/iio/adc/mcp3564.c
• struct mcp3564_chip_info(9)

ngl bestie, if you're poking at this struct directly you better be holding that lock. synchronize access to driver's state members. i said what i said 💅

okay that's the whole page, ily, go read struct mcp3564_chip_info(9) next for the lore 🧚💜

— sourced from ./drivers/iio/adc, dated October 2026. bye bestie, mwah! 🍓🌸