Staging: comedi: add acl7225b driver

/*

 * comedi/drivers/acl7225b.c

 * Driver for Adlink NuDAQ ACL-7225b and clones

 * José Luis Sánchez

 */

/*

Driver: acl7225b

Description: Adlink NuDAQ ACL-7225b & compatibles

Author: José Luis Sánchez (jsanchezv@teleline.es)

Status: testing

Devices: [Adlink] ACL-7225b (acl7225b), [ICP] P16R16DIO (p16r16dio)

*/

#include "../comedidev.h"

#include <linux/ioport.h>

#define ACL7225_SIZE   8	/* Requires 8 ioports, but only 4 are used */

#define P16R16DIO_SIZE 4

#define ACL7225_RIO_LO 0	/* Relays input/output low byte (R0-R7) */

#define ACL7225_RIO_HI 1	/* Relays input/output high byte (R8-R15) */

#define ACL7225_DI_LO  2	/* Digital input low byte (DI0-DI7) */

#define ACL7225_DI_HI  3	/* Digital input high byte (DI8-DI15) */

static int acl7225b_attach(comedi_device * dev, comedi_devconfig * it);

static int acl7225b_detach(comedi_device * dev);

typedef struct {

	const char *name;	// driver name

	int io_range;		// len of I/O space

} boardtype;

static const boardtype boardtypes[] = {

	{"acl7225b", ACL7225_SIZE,},

	{"p16r16dio", P16R16DIO_SIZE,},

};

#define n_boardtypes (sizeof(boardtypes)/sizeof(boardtype))

#define this_board ((const boardtype *)dev->board_ptr)

static comedi_driver driver_acl7225b = {

      driver_name:"acl7225b",

      module:THIS_MODULE,

      attach:acl7225b_attach,

      detach:acl7225b_detach,

      board_name:&boardtypes[0].name,

      num_names:n_boardtypes,

      offset:sizeof(boardtype),

};

COMEDI_INITCLEANUP(driver_acl7225b);

static int acl7225b_do_insn(comedi_device * dev, comedi_subdevice * s,

	comedi_insn * insn, lsampl_t * data)

{

	if (insn->n != 2)

		return -EINVAL;

	if (data[0]) {

		s->state &= ~data[0];

		s->state |= (data[0] & data[1]);

	}

	if (data[0] & 0x00ff)

		outb(s->state & 0xff, dev->iobase + (unsigned long)s->private);

	if (data[0] & 0xff00)

		outb((s->state >> 8),

			dev->iobase + (unsigned long)s->private + 1);

	data[1] = s->state;

	return 2;

}

static int acl7225b_di_insn(comedi_device * dev, comedi_subdevice * s,

	comedi_insn * insn, lsampl_t * data)

{

	if (insn->n != 2)

		return -EINVAL;

	data[1] = inb(dev->iobase + (unsigned long)s->private) |

		(inb(dev->iobase + (unsigned long)s->private + 1) << 8);

	return 2;

}

static int acl7225b_attach(comedi_device * dev, comedi_devconfig * it)

{

	comedi_subdevice *s;

	int iobase, iorange;

	iobase = it->options[0];

	iorange = this_board->io_range;

	printk("comedi%d: acl7225b: board=%s 0x%04x ", dev->minor,

		this_board->name, iobase);

	if (!request_region(iobase, iorange, "acl7225b")) {

		printk("I/O port conflict\n");

		return -EIO;

	}

	dev->board_name = this_board->name;

	dev->iobase = iobase;

	dev->irq = 0;

	if (alloc_subdevices(dev, 3) < 0)

		return -ENOMEM;

	s = dev->subdevices + 0;

	/* Relays outputs */

	s->type = COMEDI_SUBD_DO;

	s->subdev_flags = SDF_WRITABLE;

	s->maxdata = 1;

	s->n_chan = 16;

	s->insn_bits = acl7225b_do_insn;

	s->range_table = &range_digital;

	s->private = (void *)ACL7225_RIO_LO;

	s = dev->subdevices + 1;

	/* Relays status */

	s->type = COMEDI_SUBD_DI;

	s->subdev_flags = SDF_READABLE;

	s->maxdata = 1;

	s->n_chan = 16;

	s->insn_bits = acl7225b_di_insn;

	s->range_table = &range_digital;

	s->private = (void *)ACL7225_RIO_LO;

	s = dev->subdevices + 2;

	/* Isolated digital inputs */

	s->type = COMEDI_SUBD_DI;

	s->subdev_flags = SDF_READABLE;

	s->maxdata = 1;

	s->n_chan = 16;

	s->insn_bits = acl7225b_di_insn;

	s->range_table = &range_digital;

	s->private = (void *)ACL7225_DI_LO;

	printk("\n");

	return 0;

}

static int acl7225b_detach(comedi_device * dev)

{

	printk("comedi%d: acl7225b: remove\n", dev->minor);

	if (dev->iobase)

		release_region(dev->iobase, this_board->io_range);

	return 0;

}