simplecmd_store(9)

🎀 NAME 🎀

simplecmd_store — bestie, this is the one that sends a simple IPC command 💅

So like, this page? It's from the Kernel API Manual, and it's all about yeeting a lil' command off to the PMC. iykyk ✨

---

✨ SYNOPSIS ✨

ssize_t simplecmd_store (struct device *dev , struct device_attribute
*attr , const char *buf , size_t count );

That's the whole vibe check right there 🫶

---

🌸 ARGUMENTS 🌸

• dev — the device that the attribute is chillin' under 🏠
• attr — the attribute in question, aka the one being talked about 👀
• buf — the buffer holding the data that's getting stored to the attribute 📦
• count — how many bytes are in buf (the length, the size, the whole deal) 🔢

---

💖 DESCRIPTION 💖

Okay so lowkey here's the tea: this function expects a string with two integers separated with space 🍓

Those two values? They hold the command and the subcommand that gets sent to the PMC. That's it, that's the whole job, and honestly? Iconic. 👑

---

🔥 RETURN 🔥

On success it returns the number of bytes written — which is count, no cap — or a negative errno if something went wrong 😭

---

🦋 SEE ALSO 🦋

The kernel file ./drivers/mfd/intel_pmc_bxt.c is the main character here, and you gotta go look at intel_pmc_gcr_read64(9), intel_pmc_gcr_update(9), intel_pmc_s0ix_counter_read(9), and northpeak_store(9) too ✨

---

ngl bestie, send a real command with real subcommand integers or the negative errno will absolutely humble you 💀

---

And that's the page!! 🧚‍♀️ Straight from ./drivers/mfd, dated October 2026, slaying in the Kernel API Manual the entire time. Periodt. 💜🌈⭐