drivers/comedi/drivers/amplc_pc263.c

Source file repositories/reference/linux-study-clean/drivers/comedi/drivers/amplc_pc263.c

File Facts

System
Linux kernel
Corpus path
drivers/comedi/drivers/amplc_pc263.c
Extension
.c
Size
2492 bytes
Lines
104
Domain
Driver Families
Bucket
drivers/comedi
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

struct pc263_board {
	const char *name;
};

static const struct pc263_board pc263_boards[] = {
	{
		.name = "pc263",
	},
};

static int pc263_do_insn_bits(struct comedi_device *dev,
			      struct comedi_subdevice *s,
			      struct comedi_insn *insn,
			      unsigned int *data)
{
	if (comedi_dio_update_state(s, data)) {
		outb(s->state & 0xff, dev->iobase + PC263_DO_0_7_REG);
		outb((s->state >> 8) & 0xff, dev->iobase + PC263_DO_8_15_REG);
	}

	data[1] = s->state;

	return insn->n;
}

static int pc263_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
	struct comedi_subdevice *s;
	int ret;

	ret = comedi_check_request_region(dev, it->options[0], 0x2,
					  0, 0x7ff, 2);
	if (ret)
		return ret;

	ret = comedi_alloc_subdevices(dev, 1);
	if (ret)
		return ret;

	/* Digital Output subdevice */
	s = &dev->subdevices[0];
	s->type		= COMEDI_SUBD_DO;
	s->subdev_flags	= SDF_WRITABLE;
	s->n_chan	= 16;
	s->maxdata	= 1;
	s->range_table	= &range_digital;
	s->insn_bits	= pc263_do_insn_bits;

	/* read initial relay state */
	s->state = inb(dev->iobase + PC263_DO_0_7_REG) |
		   (inb(dev->iobase + PC263_DO_8_15_REG) << 8);

	return 0;
}

static struct comedi_driver amplc_pc263_driver = {
	.driver_name	= "amplc_pc263",
	.module		= THIS_MODULE,
	.attach		= pc263_attach,
	.detach		= comedi_legacy_detach,
	.board_name	= &pc263_boards[0].name,
	.offset		= sizeof(struct pc263_board),
	.num_names	= ARRAY_SIZE(pc263_boards),
};

module_comedi_driver(amplc_pc263_driver);

MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for Amplicon PC263 relay board");
MODULE_LICENSE("GPL");

Annotation

Implementation Notes