drivers/usb/misc/usbtest.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/misc/usbtest.c

Extension

.c

Size

80217 bytes

Lines

3080

Domain

Driver Families

Bucket

drivers/usb

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/errno.h
• linux/init.h
• linux/slab.h
• linux/mm.h
• linux/module.h
• linux/moduleparam.h
• linux/scatterlist.h
• linux/mutex.h
• linux/timer.h
• linux/usb.h

Detected Declarations

• struct usbtest_param_32
• struct usbtest_param_64
• struct usbtest_info
• struct usbtest_dev
• struct sg_timeout
• struct ctrl_ctx
• struct subcase
• struct queued_ctx
• struct transfer_context
• function endpoint_update
• function get_endpoints
• function simple_callback
• function get_maxpacket
• function ss_isoc_get_packet_num
• function simple_fill_buf
• function buffer_offset
• function check_guard_bytes
• function simple_check_buf
• function simple_free_urb
• function simple_io
• function free_sglist
• function alloc_sglist
• function sg_timeout
• function perform_sglist
• function get_altsetting
• function set_altsetting
• function is_good_config
• function is_good_ext
• function is_good_ss_cap
• function is_good_con_id
• function ch9_postconfig
• function right
• function ctrl_complete
• function usb_unlink_urb
• function test_ctrl_queue
• function unlink1_callback
• function unlink1
• function unlink_simple
• function unlink_queued_callback
• function unlink_queued
• function verify_not_halted
• function verify_halted
• function test_halt
• function test_toggle_sync
• function halt_simple
• function toggle_sync_simple
• function ctrl_out
• function complicated_callback

Annotated Snippet

module_init(usbtest_init);

static void __exit usbtest_exit(void)
{
	usb_deregister(&usbtest_driver);
}
module_exit(usbtest_exit);

MODULE_DESCRIPTION("USB Core/HCD Testing Driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/errno.h`, `linux/init.h`, `linux/slab.h`, `linux/mm.h`, `linux/module.h`, `linux/moduleparam.h`, `linux/scatterlist.h`.
• Detected declarations: `struct usbtest_param_32`, `struct usbtest_param_64`, `struct usbtest_info`, `struct usbtest_dev`, `struct sg_timeout`, `struct ctrl_ctx`, `struct subcase`, `struct queued_ctx`, `struct transfer_context`, `function endpoint_update`.
• Atlas domain: Driver Families / drivers/usb.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.