hw_test_and_write(9)

✨ hw_test_and_write(9) ✨

okay so bestie, welcome to the Kernel API Manual corner of the group chat. Today's main character is hw_test_and_write, and the NAME line is literally right here: it tests & writes a hw register. 💅✨

🎀 NAME 🎀

hw_test_and_write — tests & writes a hw register.

🦋 SYNOPSIS 🦋

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

🌸 ARGUMENTS 🌸

• ci — the controller.
• reg — register index.
• mask — bitfield mask.
• data — new value.

💖 DESCRIPTION 💖

The DESCRIPTION is short and sweet: this function returns register contents. That's the whole flex, no cap. 😭✨

🌈 SEE ALSO 🌈

bestie, the kernel file to peek at is ./drivers/usb/chipidea/ci.h, and these friends are all linked too:

• 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_clear(9)
• ci_otg_is_fsm_mode(9)

mwah 💋 this page is signing off from ./drivers/usb/chipidea, dated October 2026 — bye bestie! 🫶🎀