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linux/drivers/comedi/drivers/comedi_parport.c
Greg Kroah-Hartman 8ffdff6a8c staging: comedi: move out of staging directory 
The comedi code came into the kernel back in 2008, but traces its
lifetime to much much earlier.  It's been polished and buffed and
there's really nothing preventing it from being part of the "real"
portion of the kernel.

So move it to drivers/comedi/ as it belongs there.

Many thanks to the hundreds of developers who did the work to make this
happen.

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Link: https://lore.kernel.org/r/YHauop4u3sP6lz8j@kroah.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-15 09:26:25 +02:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* comedi_parport.c
* Comedi driver for standard parallel port
*
* For more information see:
* http://retired.beyondlogic.org/spp/parallel.htm
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 1998,2001 David A. Schleef <ds@schleef.org>
*/
/*
* 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 (optional)
*
* Parallel Port Lines:
*
* pin subdev chan type name
* ----- ------ ---- ---- --------------
* 1 2 0 DO strobe
* 2 0 0 DIO data 0
* 3 0 1 DIO data 1
* 4 0 2 DIO data 2
* 5 0 3 DIO data 3
* 6 0 4 DIO data 4
* 7 0 5 DIO data 5
* 8 0 6 DIO data 6
* 9 0 7 DIO data 7
* 10 1 3 DI ack
* 11 1 4 DI busy
* 12 1 2 DI paper out
* 13 1 1 DI select in
* 14 2 1 DO auto LF
* 15 1 0 DI error
* 16 2 2 DO init
* 17 2 3 DO select printer
* 18-25 ground
*
* When an IRQ is configured 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 trigger, which can be used to wake up tasks.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include "../comedidev.h"
/*
* Register map
*/
#define PARPORT_DATA_REG 0x00
#define PARPORT_STATUS_REG 0x01
#define PARPORT_CTRL_REG 0x02
#define PARPORT_CTRL_IRQ_ENA BIT(4)
#define PARPORT_CTRL_BIDIR_ENA BIT(5)
static int parport_data_reg_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
if (comedi_dio_update_state(s, data))
outb(s->state, dev->iobase + PARPORT_DATA_REG);
data[1] = inb(dev->iobase + PARPORT_DATA_REG);
return insn->n;
}
static int parport_data_reg_insn_config(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int ctrl;
int ret;
ret = comedi_dio_insn_config(dev, s, insn, data, 0xff);
if (ret)
return ret;
ctrl = inb(dev->iobase + PARPORT_CTRL_REG);
if (s->io_bits)
ctrl &= ~PARPORT_CTRL_BIDIR_ENA;
else
ctrl |= PARPORT_CTRL_BIDIR_ENA;
outb(ctrl, dev->iobase + PARPORT_CTRL_REG);
return insn->n;
}
static int parport_status_reg_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
data[1] = inb(dev->iobase + PARPORT_STATUS_REG) >> 3;
return insn->n;
}
static int parport_ctrl_reg_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int ctrl;
if (comedi_dio_update_state(s, data)) {
ctrl = inb(dev->iobase + PARPORT_CTRL_REG);
ctrl &= (PARPORT_CTRL_IRQ_ENA | PARPORT_CTRL_BIDIR_ENA);
ctrl |= s->state;
outb(ctrl, dev->iobase + PARPORT_CTRL_REG);
}
data[1] = s->state;
return insn->n;
}
static int parport_intr_insn_bits(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 |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
err |= comedi_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 */
/* Step 3: check if arguments are trivially valid */
err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0);
err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
cmd->chanlist_len);
err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
if (err)
return 3;
/* Step 4: fix up any arguments */
/* Step 5: check channel list if it exists */
return 0;
}
static int parport_intr_cmd(struct comedi_device *dev,
struct comedi_subdevice *s)
{
unsigned int ctrl;
ctrl = inb(dev->iobase + PARPORT_CTRL_REG);
ctrl |= PARPORT_CTRL_IRQ_ENA;
outb(ctrl, dev->iobase + PARPORT_CTRL_REG);
return 0;
}
static int parport_intr_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
unsigned int ctrl;
ctrl = inb(dev->iobase + PARPORT_CTRL_REG);
ctrl &= ~PARPORT_CTRL_IRQ_ENA;
outb(ctrl, dev->iobase + PARPORT_CTRL_REG);
return 0;
}
static irqreturn_t parport_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
struct comedi_subdevice *s = dev->read_subdev;
unsigned int ctrl;
unsigned short val = 0;
ctrl = inb(dev->iobase + PARPORT_CTRL_REG);
if (!(ctrl & PARPORT_CTRL_IRQ_ENA))
return IRQ_NONE;
comedi_buf_write_samples(s, &val, 1);
comedi_handle_events(dev, s);
return IRQ_HANDLED;
}
static int parport_attach(struct comedi_device *dev,
struct comedi_devconfig *it)
{
struct comedi_subdevice *s;
int ret;
ret = comedi_request_region(dev, it->options[0], 0x03);
if (ret)
return ret;
if (it->options[1]) {
ret = request_irq(it->options[1], parport_interrupt, 0,
dev->board_name, dev);
if (ret == 0)
dev->irq = it->options[1];
}
ret = comedi_alloc_subdevices(dev, dev->irq ? 4 : 3);
if (ret)
return ret;
/* Digial I/O subdevice - Parallel port DATA register */
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_data_reg_insn_bits;
s->insn_config = parport_data_reg_insn_config;
/* Digial Input subdevice - Parallel port STATUS register */
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_status_reg_insn_bits;
/* Digial Output subdevice - Parallel port CONTROL register */
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_ctrl_reg_insn_bits;
if (dev->irq) {
/* Digial Input subdevice - Interrupt support */
s = &dev->subdevices[3];
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_bits;
s->len_chanlist = 1;
s->do_cmdtest = parport_intr_cmdtest;
s->do_cmd = parport_intr_cmd;
s->cancel = parport_intr_cancel;
}
outb(0, dev->iobase + PARPORT_DATA_REG);
outb(0, dev->iobase + PARPORT_CTRL_REG);
return 0;
}
static struct comedi_driver parport_driver = {
.driver_name = "comedi_parport",
.module = THIS_MODULE,
.attach = parport_attach,
.detach = comedi_legacy_detach,
};
module_comedi_driver(parport_driver);
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi: Standard parallel port driver");
MODULE_LICENSE("GPL");
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