STRUCT ALTR_I2C_DEV(9)

Okay bestie, welcome to the Kernel API Manual — section 9 energy — where we’re decoding struct altr_i2c_dev and making it make sense 💅✨

💖 NAME 💖

struct altr_i2c_dev — the I2C device context. That’s the whole vibe: this struct is the little home base for an I2C device’s context 🫶

🌸 SYNOPSIS 🌸

Here’s the exact struct, no cap, every field kept safe and sound:

       struct altr_i2c_dev {
           void __iomem *base;
           struct i2c_msg *msg;
           size_t msg_len;
           int msg_err;
           struct completion msg_complete;
           struct device *dev;
           struct i2c_adapter adapter;
           struct clk *i2c_clk;
           u32 bus_clk_rate;
           u8 *buf;
           u32 fifo_size;
           u32 isr_mask;
           u32 isr_status;
           struct mutex isr_mutex;
        };

🎀 Members 🎀

Okay so here’s the whole cast of this struct — every single one, none skipped 👑

• base — pointer to the register struct. Like, the address-energy starting point ✨
• msg — pointer to the current message. The message currently getting the spotlight 📨
• msg_len — number of bytes transferred in msg. Byte count, very demure, very precise 🎀
• msg_err — error code for a completed message. If something went off, this is where the tea is ☕
• msg_complete — the xfer completion object. Completion object doing completion-object things 💫
• dev — device reference. The device link-up 🫶
• adapter — core i2c abstraction. The i2c core abstraction layer of it all 🌈
• i2c_clk — clock reference for the i2c input clock. Clock ref, iconic ⏰
• bus_clk_rate — current i2c bus clock rate. The bus clock’s current rate, periodt 💅
• buf — ptr to msg buffer for easier use. Buffer pointer, here to make life easier 🧚
• fifo_size — size of the FIFO passed in. FIFO size, passed in, noted 📦
• isr_mask — cached copy of local ISR enables. Cached local ISR enable copy, lowkey important 🔥
• isr_status — cached copy of local ISR status. Cached local ISR status copy, also important 👀
• isr_mutex — mutex for the IRQ thread. The IRQ thread’s mutex, keeping things from getting chaotic 💀

🔥 SEE ALSO 🔥

• Kernel file ./drivers/i2c/busses/i2c-altera.c — that’s the one, bestie, go read it 📖✨

Catch you in the ./drivers/i2c/busses pages, dated October 2026 — struct altr_i2c_dev(9) out 💅💖