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comedi/drivers/ssv_dnp.c
generic comedi driver for SSV Embedded Systems' DIL/Net-PCs
Copyright (C) 2001 Robert Schwebel <robert@schwebel.de>
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 2000 David A. Schleef <ds@schleef.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
/*
Driver: ssv_dnp
Description: SSV Embedded Systems DIL/Net-PC
Author: Robert Schwebel <robert@schwebel.de>
Devices: [SSV Embedded Systems] DIL/Net-PC 1486 (dnp-1486)
Status: unknown
*/
/* include files ----------------------------------------------------------- */
#include <linux/module.h>
#include "../comedidev.h"
/* Some global definitions: the registers of the DNP ----------------------- */
/* */
/* For port A and B the mode register has bits corresponding to the output */
/* pins, where Bit-N = 0 -> input, Bit-N = 1 -> output. Note that bits */
/* 4 to 7 correspond to pin 0..3 for port C data register. Ensure that bits */
/* 0..3 remain unchanged! For details about Port C Mode Register see */
/* the remarks in dnp_insn_config() below. */
#define CSCIR 0x22 /* Chip Setup and Control Index Register */
#define CSCDR 0x23 /* Chip Setup and Control Data Register */
#define PAMR 0xa5 /* Port A Mode Register */
#define PADR 0xa9 /* Port A Data Register */
#define PBMR 0xa4 /* Port B Mode Register */
#define PBDR 0xa8 /* Port B Data Register */
#define PCMR 0xa3 /* Port C Mode Register */
#define PCDR 0xa7 /* Port C Data Register */
/* ------------------------------------------------------------------------- */
/* The insn_bits interface allows packed reading/writing of DIO channels. */
/* The comedi core can convert between insn_bits and insn_read/write, so you */
/* are able to use these instructions as well. */
/* ------------------------------------------------------------------------- */
static int dnp_dio_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
/* The insn data is a mask in data[0] and the new data in data[1], */
/* each channel cooresponding to a bit. */
/* Ports A and B are straight forward: each bit corresponds to an */
/* output pin with the same order. Port C is different: bits 0...3 */
/* correspond to bits 4...7 of the output register (PCDR). */
if (data[0]) {
outb(PADR, CSCIR);
outb((inb(CSCDR)
& ~(u8) (data[0] & 0x0000FF))
| (u8) (data[1] & 0x0000FF), CSCDR);
outb(PBDR, CSCIR);
outb((inb(CSCDR)
& ~(u8) ((data[0] & 0x00FF00) >> 8))
| (u8) ((data[1] & 0x00FF00) >> 8), CSCDR);
outb(PCDR, CSCIR);
outb((inb(CSCDR)
& ~(u8) ((data[0] & 0x0F0000) >> 12))
| (u8) ((data[1] & 0x0F0000) >> 12), CSCDR);
}
/* on return, data[1] contains the value of the digital input lines. */
outb(PADR, CSCIR);
data[1] = inb(CSCDR);
outb(PBDR, CSCIR);
data[1] += inb(CSCDR) << 8;
outb(PCDR, CSCIR);
data[1] += ((inb(CSCDR) & 0xF0) << 12);
return insn->n;
}
static int dnp_dio_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int mask;
unsigned int val;
int ret;
ret = comedi_dio_insn_config(dev, s, insn, data, 0);
if (ret)
return ret;
if (chan < 8) { /* Port A */
mask = 1 << chan;
outb(PAMR, CSCIR);
} else if (chan < 16) { /* Port B */
mask = 1 << (chan - 8);
outb(PBMR, CSCIR);
} else { /* Port C */
/*
* We have to pay attention with port C.
* This is the meaning of PCMR:
* Bit in PCMR: 7 6 5 4 3 2 1 0
* Corresponding port C pin: d 3 d 2 d 1 d 0 d= don't touch
*
* Multiplication by 2 brings bits into correct position
* for PCMR!
*/
mask = 1 << ((chan - 16) * 2);
outb(PCMR, CSCIR);
}
val = inb(CSCDR);
if (data[0] == COMEDI_OUTPUT)
val |= mask;
else
val &= ~mask;
outb(val, CSCDR);
return insn->n;
}
static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
struct comedi_subdevice *s;
int ret;
ret = comedi_alloc_subdevices(dev, 1);
if (ret)
return ret;
s = &dev->subdevices[0];
/* digital i/o subdevice */
s->type = COMEDI_SUBD_DIO;
s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
s->n_chan = 20;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = dnp_dio_insn_bits;
s->insn_config = dnp_dio_insn_config;
/* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
* allocated for the primary 8259, so we don't need to allocate them
* ourselves. */
/* configure all ports as input (default) */
outb(PAMR, CSCIR);
outb(0x00, CSCDR);
outb(PBMR, CSCIR);
outb(0x00, CSCDR);
outb(PCMR, CSCIR);
outb((inb(CSCDR) & 0xAA), CSCDR);
dev_info(dev->class_dev, "%s: attached\n", dev->board_name);
return 1;
}
static void dnp_detach(struct comedi_device *dev)
{
outb(PAMR, CSCIR);
outb(0x00, CSCDR);
outb(PBMR, CSCIR);
outb(0x00, CSCDR);
outb(PCMR, CSCIR);
outb((inb(CSCDR) & 0xAA), CSCDR);
}
static struct comedi_driver dnp_driver = {
.driver_name = "dnp-1486",
.module = THIS_MODULE,
.attach = dnp_attach,
.detach = dnp_detach,
};
module_comedi_driver(dnp_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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