drivers/net/can/sja1000/sja1000.c

File Facts

System

Linux kernel

Corpus path

drivers/net/can/sja1000/sja1000.c

Extension

.c

Size

18162 bytes

Lines

708

Domain

Driver Families

Bucket

drivers/net

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/module.h
• linux/init.h
• linux/kernel.h
• linux/sched.h
• linux/types.h
• linux/fcntl.h
• linux/interrupt.h
• linux/ptrace.h
• linux/string.h
• linux/errno.h
• linux/ethtool.h
• linux/netdevice.h
• linux/if_arp.h
• linux/if_ether.h
• linux/skbuff.h
• linux/delay.h
• linux/can/dev.h
• linux/can/error.h
• sja1000.h

Detected Declarations

• function sja1000_write_cmdreg
• function sja1000_is_absent
• function sja1000_probe_chip
• function set_reset_mode
• function set_normal_mode
• function chipset_init
• function sja1000_start
• function sja1000_set_mode
• function sja1000_set_bittiming
• function sja1000_get_berr_counter
• function sja1000_start_xmit
• function sja1000_rx
• function sja1000_reset_interrupt
• function sja1000_err
• function sja1000_interrupt
• function sja1000_open
• function sja1000_close
• function free_sja1000dev
• function register_sja1000dev
• function unregister_sja1000dev
• export sja1000_interrupt
• export alloc_sja1000dev
• export free_sja1000dev
• export register_sja1000dev
• export unregister_sja1000dev

Annotated Snippet

static const struct net_device_ops sja1000_netdev_ops = {
	.ndo_open	= sja1000_open,
	.ndo_stop	= sja1000_close,
	.ndo_start_xmit	= sja1000_start_xmit,
};

static const struct ethtool_ops sja1000_ethtool_ops = {
	.get_ts_info = ethtool_op_get_ts_info,
};

int register_sja1000dev(struct net_device *dev)
{
	if (!sja1000_probe_chip(dev))
		return -ENODEV;

	dev->flags |= IFF_ECHO;	/* we support local echo */
	dev->netdev_ops = &sja1000_netdev_ops;
	dev->ethtool_ops = &sja1000_ethtool_ops;

	set_reset_mode(dev);
	chipset_init(dev);

	return register_candev(dev);
}
EXPORT_SYMBOL_GPL(register_sja1000dev);

void unregister_sja1000dev(struct net_device *dev)
{
	set_reset_mode(dev);
	unregister_candev(dev);
}
EXPORT_SYMBOL_GPL(unregister_sja1000dev);

Annotation

• Immediate include surface: `linux/module.h`, `linux/init.h`, `linux/kernel.h`, `linux/sched.h`, `linux/types.h`, `linux/fcntl.h`, `linux/interrupt.h`, `linux/ptrace.h`.
• Detected declarations: `function sja1000_write_cmdreg`, `function sja1000_is_absent`, `function sja1000_probe_chip`, `function set_reset_mode`, `function set_normal_mode`, `function chipset_init`, `function sja1000_start`, `function sja1000_set_mode`, `function sja1000_set_bittiming`, `function sja1000_get_berr_counter`.
• Atlas domain: Driver Families / drivers/net.
• 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.