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comedi/drivers/comedi_parport.c
hardware driver for standard parallel port
COMEDI - Linux Control and Measurement Device Interface
Copyright (C) 1998,2001 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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
Driver: comedi_parport
Description: Standard PC parallel port
Author: ds
Status: works in immediate mode
Devices: [standard] parallel port (comedi_parport)
Updated: Tue, 30 Apr 2002 21:11:45 -0700
A cheap and easy way to get a few more digital I/O lines. Steal
additional parallel ports from old computers or your neighbors'
computers.
Option list:
0: I/O port base for the parallel port.
1: IRQ
Parallel Port Lines:
pin subdev chan aka
--- ------ ---- ---
1 2 0 strobe
2 0 0 data 0
3 0 1 data 1
4 0 2 data 2
5 0 3 data 3
6 0 4 data 4
7 0 5 data 5
8 0 6 data 6
9 0 7 data 7
10 1 3 acknowledge
11 1 4 busy
12 1 2 output
13 1 1 printer selected
14 2 1 auto LF
15 1 0 error
16 2 2 init
17 2 3 select printer
18-25 ground
Notes:
Subdevices 0 is digital I/O, subdevice 1 is digital input, and
subdevice 2 is digital output. Unlike other Comedi devices,
subdevice 0 defaults to output.
Pins 13 and 14 are inverted once by Comedi and once by the
hardware, thus cancelling the effect.
Pin 1 is a strobe, thus acts like one. There's no way in software
to change this, at least on a standard parallel port.
Subdevice 3 pretends to be a digital input subdevice, but it always
returns 0 when read. However, if you run a command with
scan_begin_src=TRIG_EXT, it uses pin 10 as a external triggering
pin, which can be used to wake up tasks.
*/
/*
see http://www.beyondlogic.org/ for information.
or http://www.linux-magazin.de/ausgabe/1999/10/IO/io.html
*/
#include "../comedidev.h"
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include "comedi_fc.h"
#define PARPORT_SIZE 3
#define PARPORT_A 0
#define PARPORT_B 1
#define PARPORT_C 2
struct parport_private {
unsigned int a_data;
unsigned int c_data;
int enable_irq;
};
static int parport_insn_a(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct parport_private *devpriv = dev->private;
if (data[0]) {
devpriv->a_data &= ~data[0];
devpriv->a_data |= (data[0] & data[1]);
outb(devpriv->a_data, dev->iobase + PARPORT_A);
}
data[1] = inb(dev->iobase + PARPORT_A);
return insn->n;
}
static int parport_insn_config_a(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct parport_private *devpriv = dev->private;
if (data[0]) {
s->io_bits = 0xff;
devpriv->c_data &= ~(1 << 5);
} else {
s->io_bits = 0;
devpriv->c_data |= (1 << 5);
}
outb(devpriv->c_data, dev->iobase + PARPORT_C);
return 1;
}
static int parport_insn_b(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
if (data[0]) {
/* should writes be ignored? */
/* anyone??? */
}
data[1] = (inb(dev->iobase + PARPORT_B) >> 3);
return insn->n;
}
static int parport_insn_c(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
struct parport_private *devpriv = dev->private;
data[0] &= 0x0f;
if (data[0]) {
devpriv->c_data &= ~data[0];
devpriv->c_data |= (data[0] & data[1]);
outb(devpriv->c_data, dev->iobase + PARPORT_C);
}
data[1] = devpriv->c_data & 0xf;
return insn->n;
}
static int parport_intr_insn(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
data[1] = 0;
return insn->n;
}
static int parport_intr_cmdtest(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
int err = 0;
/* Step 1 : check if triggers are trivially valid */
err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_NONE);
if (err)
return 1;
/* Step 2a : make sure trigger sources are unique */
/* Step 2b : and mutually compatible */
if (err)
return 2;
/* Step 3: check if arguments are trivially valid */
err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, 1);
err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
if (err)
return 3;
/* step 4: ignored */
if (err)
return 4;
return 0;
}
static int parport_intr_cmd(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct parport_private *devpriv = dev->private;
devpriv->c_data |= 0x10;
outb(devpriv->c_data, dev->iobase + PARPORT_C);
devpriv->enable_irq = 1;
return 0;
}
static int parport_intr_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct parport_private *devpriv = dev->private;
devpriv->c_data &= ~0x10;
outb(devpriv->c_data, dev->iobase + PARPORT_C);
devpriv->enable_irq = 0;
return 0;
}
static irqreturn_t parport_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct parport_private *devpriv = dev->private;
struct comedi_subdevice *s = &dev->subdevices[3];
if (!devpriv->enable_irq)
return IRQ_NONE;
comedi_buf_put(s->async, 0);
s->async->events |= COMEDI_CB_BLOCK | COMEDI_CB_EOS;
comedi_event(dev, s);
return IRQ_HANDLED;
}
static int parport_attach(struct comedi_device *dev,
struct comedi_devconfig *it)
{
struct parport_private *devpriv;
int ret;
unsigned int irq;
unsigned long iobase;
struct comedi_subdevice *s;
dev->board_name = dev->driver->driver_name;
iobase = it->options[0];
if (!request_region(iobase, PARPORT_SIZE, dev->board_name)) {
dev_err(dev->class_dev, "I/O port conflict\n");
return -EIO;
}
dev->iobase = iobase;
irq = it->options[1];
if (irq) {
ret = request_irq(irq, parport_interrupt, 0, dev->board_name,
dev);
if (ret < 0) {
dev_err(dev->class_dev, "irq not available\n");
return -EINVAL;
}
dev->irq = irq;
}
ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;
devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
if (!devpriv)
return -ENOMEM;
dev->private = devpriv;
s = &dev->subdevices[0];
s->type = COMEDI_SUBD_DIO;
s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
s->n_chan = 8;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = parport_insn_a;
s->insn_config = parport_insn_config_a;
s = &dev->subdevices[1];
s->type = COMEDI_SUBD_DI;
s->subdev_flags = SDF_READABLE;
s->n_chan = 5;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = parport_insn_b;
s = &dev->subdevices[2];
s->type = COMEDI_SUBD_DO;
s->subdev_flags = SDF_WRITABLE;
s->n_chan = 4;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = parport_insn_c;
s = &dev->subdevices[3];
if (irq) {
dev->read_subdev = s;
s->type = COMEDI_SUBD_DI;
s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
s->n_chan = 1;
s->maxdata = 1;
s->range_table = &range_digital;
s->insn_bits = parport_intr_insn;
s->do_cmdtest = parport_intr_cmdtest;
s->do_cmd = parport_intr_cmd;
s->cancel = parport_intr_cancel;
} else {
s->type = COMEDI_SUBD_UNUSED;
}
devpriv->a_data = 0;
outb(devpriv->a_data, dev->iobase + PARPORT_A);
devpriv->c_data = 0;
outb(devpriv->c_data, dev->iobase + PARPORT_C);
dev_info(dev->class_dev, "%s: iobase=0x%04lx, irq %sabled",
dev->board_name, dev->iobase, dev->irq ? "en" : "dis");
return 0;
}
static void parport_detach(struct comedi_device *dev)
{
if (dev->iobase)
release_region(dev->iobase, PARPORT_SIZE);
if (dev->irq)
free_irq(dev->irq, dev);
}
static struct comedi_driver parport_driver = {
.driver_name = "comedi_parport",
.module = THIS_MODULE,
.attach = parport_attach,
.detach = parport_detach,
};
module_comedi_driver(parport_driver);
MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
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