[deliverable/linux.git] / drivers / staging / comedi / drivers / comedi_parport.c

/*
    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>

#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;
};
#define devpriv ((struct parport_private *)(dev->private))

static int parport_insn_a(struct comedi_device *dev, struct comedi_subdevice *s,
			  struct comedi_insn *insn, unsigned int *data)
{
	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 2;
}

static int parport_insn_config_a(struct comedi_device *dev,
				 struct comedi_subdevice *s,
				 struct comedi_insn *insn, unsigned int *data)
{
	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 2;
}

static int parport_insn_c(struct comedi_device *dev, struct comedi_subdevice *s,
			  struct comedi_insn *insn, unsigned int *data)
{
	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 2;
}

static int parport_intr_insn(struct comedi_device *dev,
			     struct comedi_subdevice *s,
			     struct comedi_insn *insn, unsigned int *data)
{
	if (insn->n < 1)
		return -EINVAL;

	data[1] = 0;
	return 2;
}

static int parport_intr_cmdtest(struct comedi_device *dev,
				struct comedi_subdevice *s,
				struct comedi_cmd *cmd)
{
	int err = 0;
	int tmp;

	/* step 1 */

	tmp = cmd->start_src;
	cmd->start_src &= TRIG_NOW;
	if (!cmd->start_src || tmp != cmd->start_src)
		err++;

	tmp = cmd->scan_begin_src;
	cmd->scan_begin_src &= TRIG_EXT;
	if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
		err++;

	tmp = cmd->convert_src;
	cmd->convert_src &= TRIG_FOLLOW;
	if (!cmd->convert_src || tmp != cmd->convert_src)
		err++;

	tmp = cmd->scan_end_src;
	cmd->scan_end_src &= TRIG_COUNT;
	if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
		err++;

	tmp = cmd->stop_src;
	cmd->stop_src &= TRIG_NONE;
	if (!cmd->stop_src || tmp != cmd->stop_src)
		err++;

	if (err)
		return 1;

	/* step 2: ignored */

	if (err)
		return 2;

	/* step 3: */

	if (cmd->start_arg != 0) {
		cmd->start_arg = 0;
		err++;
	}
	if (cmd->scan_begin_arg != 0) {
		cmd->scan_begin_arg = 0;
		err++;
	}
	if (cmd->convert_arg != 0) {
		cmd->convert_arg = 0;
		err++;
	}
	if (cmd->scan_end_arg != 1) {
		cmd->scan_end_arg = 1;
		err++;
	}
	if (cmd->stop_arg != 0) {
		cmd->stop_arg = 0;
		err++;
	}

	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)
{
	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)
{
	printk(KERN_DEBUG "parport_intr_cancel()\n");

	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 comedi_subdevice *s = dev->subdevices + 3;

	if (!devpriv->enable_irq) {
		printk(KERN_ERR "comedi_parport: bogus irq, ignored\n");
		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)
{
	int ret;
	unsigned int irq;
	unsigned long iobase;
	struct comedi_subdevice *s;

	iobase = it->options[0];
	printk(KERN_INFO "comedi%d: parport: 0x%04lx ", dev->minor, iobase);
	if (!request_region(iobase, PARPORT_SIZE, "parport (comedi)")) {
		printk(KERN_ERR "I/O port conflict\n");
		return -EIO;
	}
	dev->iobase = iobase;

	irq = it->options[1];
	if (irq) {
		printk(KERN_INFO " irq=%u", irq);
		ret = request_irq(irq, parport_interrupt, 0, "comedi_parport",
				  dev);
		if (ret < 0) {
			printk(KERN_ERR " irq not available\n");
			return -EINVAL;
		}
		dev->irq = irq;
	}
	dev->board_name = "parport";

	ret = comedi_alloc_subdevices(dev, 4);
	if (ret)
		return ret;

	ret = alloc_private(dev, sizeof(struct parport_private));
	if (ret < 0)
		return ret;

	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);

	printk(KERN_INFO "\n");
	return 1;
}

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");
Commit	Line	Data
241ab6ad DS	1	/*
	2	comedi/drivers/comedi_parport.c
	3	hardware driver for standard parallel port
	4
	5	COMEDI - Linux Control and Measurement Device Interface
	6	Copyright (C) 1998,2001 David A. Schleef <ds@schleef.org>
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21
	22	*/
	23	/*
	24	Driver: comedi_parport
	25	Description: Standard PC parallel port
	26	Author: ds
	27	Status: works in immediate mode
	28	Devices: [standard] parallel port (comedi_parport)
	29	Updated: Tue, 30 Apr 2002 21:11:45 -0700
	30
	31	A cheap and easy way to get a few more digital I/O lines. Steal
	32	additional parallel ports from old computers or your neighbors'
	33	computers.
	34
	35	Option list:
	36	0: I/O port base for the parallel port.
	37	1: IRQ
	38
	39	Parallel Port Lines:
	40
	41	pin subdev chan aka
	42	--- ------ ---- ---
	43	1 2 0 strobe
	44	2 0 0 data 0
	45	3 0 1 data 1
	46	4 0 2 data 2
	47	5 0 3 data 3
	48	6 0 4 data 4
	49	7 0 5 data 5
	50	8 0 6 data 6
	51	9 0 7 data 7
	52	10 1 3 acknowledge
	53	11 1 4 busy
	54	12 1 2 output
	55	13 1 1 printer selected
	56	14 2 1 auto LF
	57	15 1 0 error
	58	16 2 2 init
	59	17 2 3 select printer
	60	18-25 ground
	61
	62	Notes:
	63
	64	Subdevices 0 is digital I/O, subdevice 1 is digital input, and
65	subdevice 2 is digital output. Unlike other Comedi devices,
66	subdevice 0 defaults to output.
67
68	Pins 13 and 14 are inverted once by Comedi and once by the
69	hardware, thus cancelling the effect.
70
71	Pin 1 is a strobe, thus acts like one. There's no way in software
72	to change this, at least on a standard parallel port.
73
74	Subdevice 3 pretends to be a digital input subdevice, but it always
75	returns 0 when read. However, if you run a command with
76	scan_begin_src=TRIG_EXT, it uses pin 10 as a external triggering
77	pin, which can be used to wake up tasks.
78	*/
79	/*
80	see http://www.beyondlogic.org/ for information.
81	or http://www.linux-magazin.de/ausgabe/1999/10/IO/io.html
82	*/
83
84	#include "../comedidev.h"
70265d24	85	#include <linux/interrupt.h>
241ab6ad DS	86	#include <linux/ioport.h>
	87
	88	#define PARPORT_SIZE 3
	89
	90	#define PARPORT_A 0
	91	#define PARPORT_B 1
	92	#define PARPORT_C 2
	93
652dd4e7	94	struct parport_private {
241ab6ad DS	95	unsigned int a_data;
	96	unsigned int c_data;
	97	int enable_irq;
652dd4e7 GKH	98	};
652dd4e7 GKH	99	#define devpriv ((struct parport_private *)(dev->private))
241ab6ad	100
34c43922	101	static int parport_insn_a(struct comedi_device dev, struct comedi_subdevice s,
90035c08	102	struct comedi_insn insn, unsigned int data)
241ab6ad DS	103	{
	104	if (data[0]) {
	105	devpriv->a_data &= ~data[0];
	106	devpriv->a_data \|= (data[0] & data[1]);
	107
	108	outb(devpriv->a_data, dev->iobase + PARPORT_A);
	109	}
	110
	111	data[1] = inb(dev->iobase + PARPORT_A);
	112
	113	return 2;
	114	}
	115
0a85b6f0 MT	116	static int parport_insn_config_a(struct comedi_device *dev,
0a85b6f0 MT	117	struct comedi_subdevice *s,
90035c08	118	struct comedi_insn insn, unsigned int data)
241ab6ad DS	119	{
	120	if (data[0]) {
	121	s->io_bits = 0xff;
	122	devpriv->c_data &= ~(1 << 5);
	123	} else {
	124	s->io_bits = 0;
	125	devpriv->c_data \|= (1 << 5);
	126	}
	127	outb(devpriv->c_data, dev->iobase + PARPORT_C);
	128
	129	return 1;
	130	}
	131
34c43922	132	static int parport_insn_b(struct comedi_device dev, struct comedi_subdevice s,
90035c08	133	struct comedi_insn insn, unsigned int data)
241ab6ad DS	134	{
241ab6ad DS	135	if (data[0]) {
652dd4e7 GKH	136	/* should writes be ignored? */
652dd4e7 GKH	137	/* anyone??? */
241ab6ad DS	138	}
	139
	140	data[1] = (inb(dev->iobase + PARPORT_B) >> 3);
	141
	142	return 2;
	143	}
	144
34c43922	145	static int parport_insn_c(struct comedi_device dev, struct comedi_subdevice s,
90035c08	146	struct comedi_insn insn, unsigned int data)
241ab6ad DS	147	{
	148	data[0] &= 0x0f;
	149	if (data[0]) {
	150	devpriv->c_data &= ~data[0];
	151	devpriv->c_data \|= (data[0] & data[1]);
	152
	153	outb(devpriv->c_data, dev->iobase + PARPORT_C);
	154	}
	155
	156	data[1] = devpriv->c_data & 0xf;
	157
	158	return 2;
	159	}
	160
0a85b6f0 MT	161	static int parport_intr_insn(struct comedi_device *dev,
0a85b6f0 MT	162	struct comedi_subdevice *s,
90035c08	163	struct comedi_insn insn, unsigned int data)
241ab6ad DS	164	{
	165	if (insn->n < 1)
	166	return -EINVAL;
	167
	168	data[1] = 0;
	169	return 2;
	170	}
	171
0a85b6f0 MT	172	static int parport_intr_cmdtest(struct comedi_device *dev,
0a85b6f0 MT	173	struct comedi_subdevice *s,
ea6d0d4c	174	struct comedi_cmd *cmd)
241ab6ad DS	175	{
	176	int err = 0;
	177	int tmp;
	178
	179	/* step 1 */
	180
	181	tmp = cmd->start_src;
	182	cmd->start_src &= TRIG_NOW;
	183	if (!cmd->start_src \|\| tmp != cmd->start_src)
	184	err++;
	185
	186	tmp = cmd->scan_begin_src;
	187	cmd->scan_begin_src &= TRIG_EXT;
	188	if (!cmd->scan_begin_src \|\| tmp != cmd->scan_begin_src)
	189	err++;
	190
	191	tmp = cmd->convert_src;
	192	cmd->convert_src &= TRIG_FOLLOW;
	193	if (!cmd->convert_src \|\| tmp != cmd->convert_src)
	194	err++;
	195
	196	tmp = cmd->scan_end_src;
	197	cmd->scan_end_src &= TRIG_COUNT;
	198	if (!cmd->scan_end_src \|\| tmp != cmd->scan_end_src)
	199	err++;
	200
	201	tmp = cmd->stop_src;
	202	cmd->stop_src &= TRIG_NONE;
	203	if (!cmd->stop_src \|\| tmp != cmd->stop_src)
	204	err++;
	205
	206	if (err)
	207	return 1;
	208
	209	/* step 2: ignored */
	210
	211	if (err)
	212	return 2;
	213
	214	/* step 3: */
	215
	216	if (cmd->start_arg != 0) {
	217	cmd->start_arg = 0;
	218	err++;
	219	}
	220	if (cmd->scan_begin_arg != 0) {
	221	cmd->scan_begin_arg = 0;
	222	err++;
	223	}
	224	if (cmd->convert_arg != 0) {
	225	cmd->convert_arg = 0;
	226	err++;
	227	}
	228	if (cmd->scan_end_arg != 1) {
	229	cmd->scan_end_arg = 1;
	230	err++;
	231	}
	232	if (cmd->stop_arg != 0) {
	233	cmd->stop_arg = 0;
	234	err++;
	235	}
	236
	237	if (err)
	238	return 3;
239
240	/* step 4: ignored */
241
242	if (err)
243	return 4;
244
245	return 0;
246	}
247
0a85b6f0 MT	248	static int parport_intr_cmd(struct comedi_device *dev,
0a85b6f0 MT	249	struct comedi_subdevice *s)
241ab6ad DS	250	{
	251	devpriv->c_data \|= 0x10;
	252	outb(devpriv->c_data, dev->iobase + PARPORT_C);
	253
	254	devpriv->enable_irq = 1;
	255
	256	return 0;
	257	}
	258
0a85b6f0 MT	259	static int parport_intr_cancel(struct comedi_device *dev,
0a85b6f0 MT	260	struct comedi_subdevice *s)
241ab6ad	261	{
652dd4e7	262	printk(KERN_DEBUG "parport_intr_cancel()\n");
241ab6ad DS	263
	264	devpriv->c_data &= ~0x10;
	265	outb(devpriv->c_data, dev->iobase + PARPORT_C);
	266
	267	devpriv->enable_irq = 0;
	268
	269	return 0;
	270	}
	271
70265d24	272	static irqreturn_t parport_interrupt(int irq, void *d)
241ab6ad	273	{
71b5f4f1	274	struct comedi_device *dev = d;
34c43922	275	struct comedi_subdevice *s = dev->subdevices + 3;
241ab6ad DS	276
241ab6ad DS	277	if (!devpriv->enable_irq) {
652dd4e7	278	printk(KERN_ERR "comedi_parport: bogus irq, ignored\n");
241ab6ad DS	279	return IRQ_NONE;
	280	}
	281
	282	comedi_buf_put(s->async, 0);
	283	s->async->events \|= COMEDI_CB_BLOCK \| COMEDI_CB_EOS;
	284
	285	comedi_event(dev, s);
	286	return IRQ_HANDLED;
	287	}
	288
0a85b6f0 MT	289	static int parport_attach(struct comedi_device *dev,
0a85b6f0 MT	290	struct comedi_devconfig *it)
241ab6ad DS	291	{
	292	int ret;
	293	unsigned int irq;
	294	unsigned long iobase;
34c43922	295	struct comedi_subdevice *s;
241ab6ad DS	296
241ab6ad DS	297	iobase = it->options[0];
652dd4e7	298	printk(KERN_INFO "comedi%d: parport: 0x%04lx ", dev->minor, iobase);
241ab6ad	299	if (!request_region(iobase, PARPORT_SIZE, "parport (comedi)")) {
8487d0e9	300	printk(KERN_ERR "I/O port conflict\n");
241ab6ad DS	301	return -EIO;
	302	}
	303	dev->iobase = iobase;
	304
	305	irq = it->options[1];
	306	if (irq) {
8487d0e9	307	printk(KERN_INFO " irq=%u", irq);
5f74ea14 GKH	308	ret = request_irq(irq, parport_interrupt, 0, "comedi_parport",
5f74ea14 GKH	309	dev);
241ab6ad	310	if (ret < 0) {
8487d0e9	311	printk(KERN_ERR " irq not available\n");
241ab6ad DS	312	return -EINVAL;
	313	}
	314	dev->irq = irq;
	315	}
	316	dev->board_name = "parport";
	317
2f0b9d08	318	ret = comedi_alloc_subdevices(dev, 4);
8b6c5694	319	if (ret)
241ab6ad	320	return ret;
8b6c5694	321
652dd4e7 GKH	322	ret = alloc_private(dev, sizeof(struct parport_private));
652dd4e7 GKH	323	if (ret < 0)
241ab6ad DS	324	return ret;
	325
	326	s = dev->subdevices + 0;
	327	s->type = COMEDI_SUBD_DIO;
	328	s->subdev_flags = SDF_READABLE \| SDF_WRITABLE;
	329	s->n_chan = 8;
	330	s->maxdata = 1;
	331	s->range_table = &range_digital;
	332	s->insn_bits = parport_insn_a;
	333	s->insn_config = parport_insn_config_a;
	334
	335	s = dev->subdevices + 1;
	336	s->type = COMEDI_SUBD_DI;
	337	s->subdev_flags = SDF_READABLE;
	338	s->n_chan = 5;
	339	s->maxdata = 1;
	340	s->range_table = &range_digital;
	341	s->insn_bits = parport_insn_b;
	342
	343	s = dev->subdevices + 2;
	344	s->type = COMEDI_SUBD_DO;
	345	s->subdev_flags = SDF_WRITABLE;
	346	s->n_chan = 4;
	347	s->maxdata = 1;
	348	s->range_table = &range_digital;
	349	s->insn_bits = parport_insn_c;
	350
	351	s = dev->subdevices + 3;
	352	if (irq) {
	353	dev->read_subdev = s;
	354	s->type = COMEDI_SUBD_DI;
	355	s->subdev_flags = SDF_READABLE \| SDF_CMD_READ;
	356	s->n_chan = 1;
	357	s->maxdata = 1;
	358	s->range_table = &range_digital;
	359	s->insn_bits = parport_intr_insn;
	360	s->do_cmdtest = parport_intr_cmdtest;
	361	s->do_cmd = parport_intr_cmd;
	362	s->cancel = parport_intr_cancel;
	363	} else {
	364	s->type = COMEDI_SUBD_UNUSED;
	365	}
	366
	367	devpriv->a_data = 0;
	368	outb(devpriv->a_data, dev->iobase + PARPORT_A);
	369	devpriv->c_data = 0;
	370	outb(devpriv->c_data, dev->iobase + PARPORT_C);
	371
8487d0e9	372	printk(KERN_INFO "\n");
241ab6ad DS	373	return 1;
	374	}
	375
484ecc95	376	static void parport_detach(struct comedi_device *dev)
241ab6ad	377	{
241ab6ad DS	378	if (dev->iobase)
241ab6ad DS	379	release_region(dev->iobase, PARPORT_SIZE);
241ab6ad	380	if (dev->irq)
5f74ea14	381	free_irq(dev->irq, dev);
241ab6ad	382	}
90f703d3	383
bfba5e78 HS	384	static struct comedi_driver parport_driver = {
	385	.driver_name = "comedi_parport",
	386	.module = THIS_MODULE,
	387	.attach = parport_attach,
	388	.detach = parport_detach,
	389	};
	390	module_comedi_driver(parport_driver);
	391
90f703d3 AT	392	MODULE_AUTHOR("Comedi http://www.comedi.org");
	393	MODULE_DESCRIPTION("Comedi low-level driver");
	394	MODULE_LICENSE("GPL");