drivers/char/ipmi/ipmi_si_port_io.c

Source file repositories/reference/linux-study-clean/drivers/char/ipmi/ipmi_si_port_io.c

File Facts

System
Linux kernel
Corpus path
drivers/char/ipmi/ipmi_si_port_io.c
Extension
.c
Size
2549 bytes
Lines
115
Domain
Driver Families
Bucket
drivers/char
Inferred role
Driver Families: implementation source
Status
source 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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0+

#include <linux/io.h>
#include "ipmi_si.h"

static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset)
{
	unsigned int addr = io->addr_data;

	return inb(addr + (offset * io->regspacing));
}

static void port_outb(const struct si_sm_io *io, unsigned int offset,
		      unsigned char b)
{
	unsigned int addr = io->addr_data;

	outb(b, addr + (offset * io->regspacing));
}

static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset)
{
	unsigned int addr = io->addr_data;

	return (inw(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
}

static void port_outw(const struct si_sm_io *io, unsigned int offset,
		      unsigned char b)
{
	unsigned int addr = io->addr_data;

	outw(b << io->regshift, addr + (offset * io->regspacing));
}

static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset)
{
	unsigned int addr = io->addr_data;

	return (inl(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
}

static void port_outl(const struct si_sm_io *io, unsigned int offset,
		      unsigned char b)
{
	unsigned int addr = io->addr_data;

	outl(b << io->regshift, addr+(offset * io->regspacing));
}

static void port_cleanup(struct si_sm_io *io)
{
	unsigned int addr = io->addr_data;
	int          idx;

	if (addr) {
		for (idx = 0; idx < io->io_size; idx++)
			release_region(addr + idx * io->regspacing,
				       io->regsize);
	}
}

int ipmi_si_port_setup(struct si_sm_io *io)
{
	unsigned int addr = io->addr_data;
	int          idx;

	if (!addr)
		return -ENODEV;

	/*
	 * Figure out the actual inb/inw/inl/etc routine to use based
	 * upon the register size.
	 */
	switch (io->regsize) {
	case 1:
		io->inputb = port_inb;
		io->outputb = port_outb;
		break;
	case 2:
		io->inputb = port_inw;
		io->outputb = port_outw;
		break;
	case 4:
		io->inputb = port_inl;
		io->outputb = port_outl;
		break;
	default:
		dev_warn(io->dev, "Invalid register size: %d\n",
			 io->regsize);

Annotation

Implementation Notes