hw_test_and_clear(9)

💅 hw_test_and_clear ✨

okay so real talk, we're in the Kernel API Manual today and the star of the show is hw_test_and_clear 🎀 like yes bestie we're doing kernel-level register stuff and it's giving main character energy fr fr

🌸 NAME 🌸

hw_test_and_clear — tests & clears a hw register 💫

✨ SYNOPSIS ✨

u32 hw_test_and_clear (struct ci_hdrc *ci , enum ci_hw_regs reg , u32
mask );

no cap, that's the whole vibe right there 👑

🫶 ARGUMENTS 🫶

• ci — the controller 💖 like the actual hardware dude in question
• reg — register index 📇 which register we're poking at
• mask — bitfield mask 🎀 the bits you care about, lowkey

🦋 DESCRIPTION 🦋

okay so literally, this function returns register contents ✨ that's it, that's the whole thing, and honestly? iconic. it tests & clears a hw register and hands you back the register contents — ngl she's simple, she's efficient, she ate 💅

🌈 SEE ALSO 🌈

the whole friend group, periodt 🫶:

• Kernel file ./drivers/usb/chipidea/ci.h 👑
• struct ci_hw_ep(9)
• struct ci_role_driver(9)
• struct hw_bank(9)
• struct ci_hdrc(9)
• hw_read_id_reg(9)
• hw_write_id_reg(9)
• hw_read(9)
• hw_write(9)
• hw_test_and_write(9)
• ci_otg_is_fsm_mode(9)

and that's the tea 🍓 this lil page lives over in ./drivers/usb/chipidea, dated October 2026, in the Kernel API Manual — mwah, go slay some registers bestie 💜🧚⭐