drivers/usb/serial/f81232.c

File Facts

System

Linux kernel

Corpus path

drivers/usb/serial/f81232.c

Extension

.c

Size

26422 bytes

Lines

1081

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• 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/slab.h
• linux/tty.h
• linux/tty_driver.h
• linux/tty_flip.h
• linux/serial.h
• linux/module.h
• linux/moduleparam.h
• linux/mutex.h
• linux/uaccess.h
• linux/usb.h
• linux/usb/serial.h
• linux/serial_reg.h

Detected Declarations

• struct f81232_private
• function calc_baud_divisor
• function f81232_get_register
• function f81232_set_register
• function f81232_set_mask_register
• function f81232_read_msr
• function f81232_set_mctrl
• function f81232_update_line_status
• function f81232_read_int_callback
• function f81232_handle_lsr
• function f81232_process_read_urb
• function f81534a_process_read_urb
• function f81232_break_ctl
• function f81232_find_clk
• function f81232_set_baudrate
• function f81232_port_enable
• function f81232_port_disable
• function f81232_set_termios
• function f81232_tiocmget
• function f81232_tiocmset
• function f81232_open
• function f81534a_open
• function f81232_close
• function f81232_dtr_rts
• function f81232_tx_empty
• function f81232_carrier_raised
• function f81232_get_serial
• function f81232_interrupt_work
• function f81232_lsr_worker
• function f81534a_ctrl_set_register
• function f81534a_ctrl_get_register
• function f81534a_ctrl_enable_all_ports
• function f81534a_ctrl_probe
• function f81534a_ctrl_disconnect
• function f81534a_ctrl_resume
• function f81232_port_probe
• function f81534a_port_probe
• function f81232_suspend
• function f81232_resume
• function f81232_init
• function f81232_exit
• module init f81232_init

Annotated Snippet

module_init(f81232_init);
module_exit(f81232_exit);

MODULE_DESCRIPTION("Fintek F81232/532A/534A/535/536 USB to serial driver");
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/errno.h`, `linux/slab.h`, `linux/tty.h`, `linux/tty_driver.h`, `linux/tty_flip.h`, `linux/serial.h`, `linux/module.h`.
• Detected declarations: `struct f81232_private`, `function calc_baud_divisor`, `function f81232_get_register`, `function f81232_set_register`, `function f81232_set_mask_register`, `function f81232_read_msr`, `function f81232_set_mctrl`, `function f81232_update_line_status`, `function f81232_read_int_callback`, `function f81232_handle_lsr`.
• 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.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.