STRUCT STM32_ADC(9)

📦 version 7.3.1, in nixpkgs unstable

💖 NAME 💖

okay so bestie, this is struct stm32_adc(9) from the Kernel API Manual, and it is literally the private data of each ADC IIO instance. no cap, this struct is the little main-character bundle for one ADC instance. 💅

🌸 SYNOPSIS 🌸

here's the exact shape, bestie — do not touch the tokens, just vibe with them:

       struct stm32_adc {
           struct stm32_adc_common *common;
           u32 offset;
           const struct stm32_adc_cfg      *cfg;
           struct completion       completion;
           u16 buffer[STM32_ADC_MAX_SQ + 4];
           struct clk              *clk;
           int irq;
           spinlock_t lock;
           unsigned int            bufi;
           unsigned int            num_conv;
           u32 res;
           u32 trigger_polarity;
           struct dma_chan         *dma_chan;
           u8 *rx_buf;
           dma_addr_t rx_dma_buf;
           unsigned int            rx_buf_sz;
           u32 difsel;
           u32 pcsel;
           u32 smpr_val[2];
           struct stm32_adc_calib  cal;
           struct stm32_adc_vrefint vrefint;
           char chan_name[STM32_ADC_CH_MAX][STM32_ADC_CH_SZ];
           u32 num_diff;
           int int_ch[STM32_ADC_INT_CH_NB];
           int nsmps;
           int ovs_idx;
        };

🧚 Members 🧚

okay member-by-member, no skipping, periodt:

  • common — a reference to the ADC block's common data. the shared group-chat info, basically.
  • offset — the ADC instance register offset in the ADC block. where this instance sits in the register map.
  • cfg — compatible configuration data. the config that matches the compatible.
  • completion — end of single conversion completion. the "we're done with this one conversion" signal.
  • buffer — data buffer + 8 bytes for timestamp if enabled. yes, the + 8 is literally for the timestamp when that's enabled.
  • clk — clock for this adc instance. gotta have the clock, obvi.
  • irq — interrupt for this adc instance.
  • lock — spinlock.
  • bufi — data buffer index.
  • num_conv — expected number of scan conversions.
  • res — data resolution (e.g. RES bitfield value).
  • trigger_polarity — external trigger polarity (e.g. exten).
  • dma_chan — dma channel.
  • rx_buf — dma rx buffer cpu address.
  • rx_dma_buf — dma rx buffer bus address.
  • rx_buf_sz — dma rx buffer size.
  • difsel — bitmask to set single-ended/differential channel.
  • pcsel — bitmask to preselect channels on some devices.
  • smpr_val — sampling time settings (e.g. smpr1 / smpr2).
  • cal — optional calibration data on some devices.
  • vrefint — internal reference voltage data.
  • chan_name — channel name array.
  • num_diff — number of differential channels.
  • int_ch — internal channel indexes array.
  • nsmps — number of channels with optional sample time.
  • ovs_idx — current oversampling ratio index (in oversampling array). the oversampling-array index, slay.

🔥 SEE ALSO 🔥

Kernel file: ./drivers/iio/adc/stm32-adc.c — go read the source, bestie, it's right there.

okay that's the page, ily 🫶 — footer vibes: source/version ./drivers/iio/adc, date October 2026. mwah 💋

📦 where this page comes from