usb_find_alt_setting(9)

✨ usb_find_alt_setting(9) ✨

okay so bestie, you know how you're reading the Kernel API Manual and you stumble onto some function with a whole paragraph of a name? yeah. this is usb_find_alt_setting(9) and honestly she's doing exactly what she says on the tin. let's get into it 💅

---

🌸 NAME 🌸

usb_find_alt_setting — given a configuration, find the alternate setting for the given interface. literally that's it, that's the whole gig 🫶

---

✨ SYNOPSIS ✨

struct usb_host_interface * usb_find_alt_setting (struct usb_host_config
*config , unsigned int iface_num , unsigned int alt_num );

so she returns a struct usb_host_interface *, takes a struct usb_host_config * named config, then two unsigned ints: iface_num and alt_num. icon behavior, no notes 👑

---

🎀 ARGUMENTS 🎀

• config — the configuration you wanna search. and bestie, note the tea: it does not have to be the current config. she's flexible like that ✨
• iface_num — the interface number you're searching in. get in there, find your girl 🔍
• alt_num — the alternate interface setting number you're looking for. this is the one you actually want 💖

---

🦋 DESCRIPTION 🦋

she searches the configuration's interface cache for the given alt setting. that's the move. cache girlie through and through 🧚

---

⭐ RETURN ⭐

the alternate setting, if found. otherwise NULL. simple as that — no cap 😭

ok so like, always vibe check the return value. if it's NULL, she didn't find it, and you should not be dereferencing that, bestie. that's a one-way ticket to oops town 💀

---

🌈 SEE ALSO 🌈

this is the part where the manpage lists, like, everyone in her contact list and honestly the girl is connected. source file first: Kernel file ./drivers/usb/core/usb.c 💜

• usb_find_common_endpoints(9)
• usb_find_common_endpoints_reverse(9)
• usb_find_endpoint(9)
• usb_check_bulk_endpoints(9)
• usb_check_int_endpoints(9)
• usb_ifnum_to_if(9)
• usb_altnum_to_altsetting(9)
• usb_find_interface(9)
• usb_for_each_dev(9)
• usb_release_dev(9)
• usb_alloc_dev(9)
• usb_get_dev(9)
• usb_put_dev(9)
• usb_get_intf(9)
• usb_put_intf(9)
• usb_intf_get_dma_device(9)
• usb_lock_device_for_reset(9)
• usb_get_current_frame_number(9)
• usb_alloc_coherent(9)
• usb_free_coherent(9)
• usb_alloc_noncoherent(9)
• usb_free_noncoherent(9)
• usb_endpoint_max_periodic_payload(9)
• usb_endpoint_is_hs_isoc_double(9)

like, twenty-four neighbors and they all live in ./drivers/usb/core. it's a whole cul-de-sac 🏡

---

and that's the page, bestie!! 🎀 this little masterpiece lives in ./drivers/usb/core, dated October 2026, and she's filed under usb_find_alt_setting(9) — go read her sisters, they ate 💅💖