drivers/usb/class/cdc-acm.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/class/cdc-acm.c

Extension

.c

Size

60760 bytes

Lines

2181

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/sched/signal.h
• linux/errno.h
• linux/init.h
• linux/slab.h
• linux/log2.h
• linux/tty.h
• linux/serial.h
• linux/tty_driver.h
• linux/tty_flip.h
• linux/tty_ldisc.h
• linux/module.h
• linux/mutex.h
• linux/uaccess.h
• linux/usb.h
• linux/usb/cdc.h
• asm/byteorder.h
• linux/unaligned.h
• linux/idr.h
• linux/list.h
• cdc-acm.h

Detected Declarations

• function acm_alloc_minor
• function acm_release_minor
• function acm_ctrl_msg
• function acm_set_control
• function acm_poison_urbs
• function acm_unpoison_urbs
• function acm_wb_alloc
• function acm_wb_is_avail
• function acm_write_done
• function acm_start_wb
• function bmCapabilities_show
• function wCountryCodes_show
• function iCountryCodeRelDate_show
• function acm_process_notification
• function acm_ctrl_irq
• function acm_submit_read_urb
• function acm_submit_read_urbs
• function acm_process_read_urb
• function acm_read_bulk_callback
• function acm_write_bulk
• function acm_softint
• function acm_tty_install
• function acm_tty_open
• function acm_port_dtr_rts
• function acm_port_activate
• function acm_port_destruct
• function acm_port_shutdown
• function acm_tty_cleanup
• function acm_tty_hangup
• function acm_tty_close
• function acm_tty_write
• function acm_tty_write_room
• function acm_tty_flush_buffer
• function acm_tty_chars_in_buffer
• function acm_tty_throttle
• function acm_tty_unthrottle
• function acm_tty_break_ctl
• function acm_tty_tiocmget
• function acm_tty_tiocmset
• function get_serial_info
• function set_serial_info
• function wait_serial_change
• function acm_tty_get_icount
• function acm_tty_ioctl
• function acm_tty_set_termios
• function acm_write_buffers_free
• function acm_read_buffers_free
• function acm_write_buffers_alloc

Annotated Snippet

module_init(acm_init);
module_exit(acm_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(ACM_TTY_MAJOR);

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/sched/signal.h`, `linux/errno.h`, `linux/init.h`, `linux/slab.h`, `linux/log2.h`, `linux/tty.h`, `linux/serial.h`.
• Detected declarations: `function acm_alloc_minor`, `function acm_release_minor`, `function acm_ctrl_msg`, `function acm_set_control`, `function acm_poison_urbs`, `function acm_unpoison_urbs`, `function acm_wb_alloc`, `function acm_wb_is_avail`, `function acm_write_done`, `function acm_start_wb`.
• 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.