drivers/tty/serial/jsm/jsm_driver.c

File Facts

System

Linux kernel

Corpus path

drivers/tty/serial/jsm/jsm_driver.c

Extension

.c

Size

9640 bytes

Lines

383

Domain

Driver Families

Bucket

drivers/tty

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• 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/module.h
• linux/pci.h
• linux/slab.h
• jsm.h

Detected Declarations

• function jsm_probe_one
• function jsm_remove_one
• function jsm_io_error_detected
• function jsm_io_slot_reset
• function jsm_io_resume
• function jsm_init_module
• function jsm_exit_module
• module init jsm_init_module

Annotated Snippet

static struct pci_driver jsm_driver = {
	.name		= JSM_DRIVER_NAME,
	.id_table	= jsm_pci_tbl,
	.probe		= jsm_probe_one,
	.remove		= jsm_remove_one,
	.err_handler    = &jsm_err_handler,
};

static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
					pci_channel_state_t state)
{
	struct jsm_board *brd = pci_get_drvdata(pdev);

	jsm_remove_uart_port(brd);

	return PCI_ERS_RESULT_NEED_RESET;
}

static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
{
	int rc;

	rc = pci_enable_device(pdev);

	if (rc)
		return PCI_ERS_RESULT_DISCONNECT;

	pci_set_master(pdev);

	return PCI_ERS_RESULT_RECOVERED;
}

static void jsm_io_resume(struct pci_dev *pdev)
{
	struct jsm_board *brd = pci_get_drvdata(pdev);

	pci_restore_state(pdev);

	jsm_uart_port_init(brd);
}

static int __init jsm_init_module(void)
{
	int rc;

	rc = uart_register_driver(&jsm_uart_driver);
	if (!rc) {
		rc = pci_register_driver(&jsm_driver);
		if (rc)
			uart_unregister_driver(&jsm_uart_driver);
	}
	return rc;
}

static void __exit jsm_exit_module(void)
{
	pci_unregister_driver(&jsm_driver);
	uart_unregister_driver(&jsm_uart_driver);
}

module_init(jsm_init_module);
module_exit(jsm_exit_module);

Annotation

• Immediate include surface: `linux/module.h`, `linux/pci.h`, `linux/slab.h`, `jsm.h`.
• Detected declarations: `function jsm_probe_one`, `function jsm_remove_one`, `function jsm_io_error_detected`, `function jsm_io_slot_reset`, `function jsm_io_resume`, `function jsm_init_module`, `function jsm_exit_module`, `module init jsm_init_module`.
• Atlas domain: Driver Families / drivers/tty.
• Implementation status: pattern 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.