drivers/comedi/drivers/fl512.c

Source file repositories/reference/linux-study-clean/drivers/comedi/drivers/fl512.c

File Facts

System
Linux kernel
Corpus path
drivers/comedi/drivers/fl512.c
Extension
.c
Size
3443 bytes
Lines
149
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

// SPDX-License-Identifier: GPL-2.0+
/*
 * fl512.c
 * Anders Gnistrup <ex18@kalman.iau.dtu.dk>
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
 */

/*
 * Driver: fl512
 * Description: unknown
 * Author: Anders Gnistrup <ex18@kalman.iau.dtu.dk>
 * Devices: [unknown] FL512 (fl512)
 * Status: unknown
 *
 * Digital I/O is not supported.
 *
 * Configuration options:
 *   [0] - I/O port base address
 */

#include <linux/module.h>
#include <linux/comedi/comedidev.h>
#include <linux/delay.h>

/*
 * Register I/O map
 */
#define FL512_AI_LSB_REG		0x02
#define FL512_AI_MSB_REG		0x03
#define FL512_AI_MUX_REG		0x02
#define FL512_AI_START_CONV_REG		0x03
#define FL512_AO_DATA_REG(x)		(0x04 + ((x) * 2))
#define FL512_AO_TRIG_REG(x)		(0x04 + ((x) * 2))

static const struct comedi_lrange range_fl512 = {
	4, {
		BIP_RANGE(0.5),
		BIP_RANGE(1),
		BIP_RANGE(5),
		BIP_RANGE(10),
		UNI_RANGE(1),
		UNI_RANGE(5),
		UNI_RANGE(10)
	}
};

static int fl512_ai_insn_read(struct comedi_device *dev,
			      struct comedi_subdevice *s,
			      struct comedi_insn *insn,
			      unsigned int *data)
{
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int val;
	int i;

	outb(chan, dev->iobase + FL512_AI_MUX_REG);

	for (i = 0; i < insn->n; i++) {
		outb(0, dev->iobase + FL512_AI_START_CONV_REG);

		/* XXX should test "done" flag instead of delay */
		usleep_range(30, 100);

		val = inb(dev->iobase + FL512_AI_LSB_REG);
		val |= (inb(dev->iobase + FL512_AI_MSB_REG) << 8);
		val &= s->maxdata;

		data[i] = val;
	}

	return insn->n;
}

static int fl512_ao_insn_write(struct comedi_device *dev,
			       struct comedi_subdevice *s,
			       struct comedi_insn *insn,
			       unsigned int *data)
{
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int val = s->readback[chan];
	int i;

	for (i = 0; i < insn->n; i++) {
		val = data[i];

		/* write LSB, MSB then trigger conversion */
		outb(val & 0x0ff, dev->iobase + FL512_AO_DATA_REG(chan));
		outb((val >> 8) & 0xf, dev->iobase + FL512_AO_DATA_REG(chan));

Annotation

Implementation Notes