linux/drivers/comedi/drivers/comedi_bond.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * comedi_bond.c
 * A Comedi driver to 'bond' or merge multiple drivers and devices as one.
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 2000 David A. Schleef <[email protected]>
 * Copyright (C) 2005 Calin A. Culianu <[email protected]>
 */

/*
 * Driver: comedi_bond
 * Description: A driver to 'bond' (merge) multiple subdevices from multiple
 * devices together as one.
 * Devices:
 * Author: ds
 * Updated: Mon, 10 Oct 00:18:25 -0500
 * Status: works
 *
 * This driver allows you to 'bond' (merge) multiple comedi subdevices
 * (coming from possibly difference boards and/or drivers) together.  For
 * example, if you had a board with 2 different DIO subdevices, and
 * another with 1 DIO subdevice, you could 'bond' them with this driver
 * so that they look like one big fat DIO subdevice.  This makes writing
 * applications slightly easier as you don't have to worry about managing
 * different subdevices in the application -- you just worry about
 * indexing one linear array of channel id's.
 *
 * Right now only DIO subdevices are supported as that's the personal itch
 * I am scratching with this driver.  If you want to add support for AI and AO
 * subdevs, go right on ahead and do so!
 *
 * Commands aren't supported -- although it would be cool if they were.
 *
 * Configuration Options:
 *   List of comedi-minors to bond.  All subdevices of the same type
 *   within each minor will be concatenated together in the order given here.
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/comedi.h>
#include <linux/comedi/comedilib.h>
#include <linux/comedi/comedidev.h>

struct bonded_device { … };

struct comedi_bond_private { … };

static int bonding_dio_insn_bits(struct comedi_device *dev,
				 struct comedi_subdevice *s,
				 struct comedi_insn *insn, unsigned int *data)
{ … }

static int bonding_dio_insn_config(struct comedi_device *dev,
				   struct comedi_subdevice *s,
				   struct comedi_insn *insn, unsigned int *data)
{ … }

static int do_dev_config(struct comedi_device *dev, struct comedi_devconfig *it)
{ … }

static int bonding_attach(struct comedi_device *dev,
			  struct comedi_devconfig *it)
{ … }

static void bonding_detach(struct comedi_device *dev)
{ … }

static struct comedi_driver bonding_driver = …;
module_comedi_driver(…);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;