[deliverable/linux.git] / drivers / staging / comedi / drivers / 8255.c

/*
    comedi/drivers/8255.c
    Driver for 8255

    COMEDI - Linux Control and Measurement Device Interface
    Copyright (C) 1998 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: 8255
Description: generic 8255 support
Devices: [standard] 8255 (8255)
Author: ds
Status: works
Updated: Fri,  7 Jun 2002 12:56:45 -0700

The classic in digital I/O.  The 8255 appears in Comedi as a single
digital I/O subdevice with 24 channels.  The channel 0 corresponds
to the 8255's port A, bit 0; channel 23 corresponds to port C, bit
7.  Direction configuration is done in blocks, with channels 0-7,
8-15, 16-19, and 20-23 making up the 4 blocks.  The only 8255 mode
supported is mode 0.

You should enable compilation this driver if you plan to use a board
that has an 8255 chip.  For multifunction boards, the main driver will
configure the 8255 subdevice automatically.

This driver also works independently with ISA and PCI cards that
directly map the 8255 registers to I/O ports, including cards with
multiple 8255 chips.  To configure the driver for such a card, the
option list should be a list of the I/O port bases for each of the
8255 chips.  For example,

  comedi_config /dev/comedi0 8255 0x200,0x204,0x208,0x20c

Note that most PCI 8255 boards do NOT work with this driver, and
need a separate driver as a wrapper.  For those that do work, the
I/O port base address can be found in the output of 'lspci -v'.

*/

/*
   This file contains an exported subdevice for driving an 8255.

   To use this subdevice as part of another driver, you need to
   set up the subdevice in the attach function of the driver by
   calling:

     subdev_8255_init(device, subdevice, io_function, iobase)

   device and subdevice are pointers to the device and subdevice
   structures.  io_function will be called to provide the
   low-level input/output to the device, i.e., actual register
   access.  io_function will be called with the value of iobase
   as the last parameter.  If the 8255 device is mapped as 4
   consecutive I/O ports, you can use NULL for io_function
   and the I/O port base for iobase, and an internal function will
   handle the register access.

   In addition, if the main driver handles interrupts, you can
   enable commands on the subdevice by calling subdev_8255_init_irq()
   instead.  Then, when you get an interrupt that is likely to be
   from the 8255, you should call subdev_8255_interrupt(), which
   will copy the latched value to a Comedi buffer.
 */

#include "../comedidev.h"

#include <linux/ioport.h>
#include <linux/slab.h>

#include "comedi_fc.h"
#include "8255.h"

#define _8255_SIZE	4

#define _8255_DATA	0
#define _8255_CR	3

#define CR_C_LO_IO	0x01
#define CR_B_IO		0x02
#define CR_B_MODE	0x04
#define CR_C_HI_IO	0x08
#define CR_A_IO		0x10
#define CR_A_MODE(a)	((a)<<5)
#define CR_CW		0x80

struct subdev_8255_private {
	unsigned long iobase;
	int (*io) (int, int, int, unsigned long);
};

static int subdev_8255_io(int dir, int port, int data, unsigned long iobase)
{
	if (dir) {
		outb(data, iobase + port);
		return 0;
	} else {
		return inb(iobase + port);
	}
}

void subdev_8255_interrupt(struct comedi_device *dev,
			   struct comedi_subdevice *s)
{
	struct subdev_8255_private *spriv = s->private;
	unsigned long iobase = spriv->iobase;
	short d;

	d = spriv->io(0, _8255_DATA, 0, iobase);
	d |= (spriv->io(0, _8255_DATA + 1, 0, iobase) << 8);

	comedi_buf_put(s->async, d);
	s->async->events |= COMEDI_CB_EOS;

	comedi_event(dev, s);
}
EXPORT_SYMBOL_GPL(subdev_8255_interrupt);

static int subdev_8255_insn(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data)
{
	struct subdev_8255_private *spriv = s->private;
	unsigned long iobase = spriv->iobase;
	unsigned int mask;
	unsigned int bits;
	unsigned int v;

	mask = data[0];
	bits = data[1];

	if (mask) {
		v = s->state;
		v &= ~mask;
		v |= (bits & mask);

		if (mask & 0xff)
			spriv->io(1, _8255_DATA, v & 0xff, iobase);
		if (mask & 0xff00)
			spriv->io(1, _8255_DATA + 1, (v >> 8) & 0xff, iobase);
		if (mask & 0xff0000)
			spriv->io(1, _8255_DATA + 2, (v >> 16) & 0xff, iobase);

		s->state = v;
	}

	v = spriv->io(0, _8255_DATA, 0, iobase);
	v |= (spriv->io(0, _8255_DATA + 1, 0, iobase) << 8);
	v |= (spriv->io(0, _8255_DATA + 2, 0, iobase) << 16);

	data[1] = v;

	return insn->n;
}

static void subdev_8255_do_config(struct comedi_device *dev,
				  struct comedi_subdevice *s)
{
	struct subdev_8255_private *spriv = s->private;
	unsigned long iobase = spriv->iobase;
	int config;

	config = CR_CW;
	/* 1 in io_bits indicates output, 1 in config indicates input */
	if (!(s->io_bits & 0x0000ff))
		config |= CR_A_IO;
	if (!(s->io_bits & 0x00ff00))
		config |= CR_B_IO;
	if (!(s->io_bits & 0x0f0000))
		config |= CR_C_LO_IO;
	if (!(s->io_bits & 0xf00000))
		config |= CR_C_HI_IO;

	spriv->io(1, _8255_CR, config, iobase);
}

static int subdev_8255_insn_config(struct comedi_device *dev,
				   struct comedi_subdevice *s,
				   struct comedi_insn *insn, unsigned int *data)
{
	unsigned int mask;
	unsigned int bits;

	mask = 1 << CR_CHAN(insn->chanspec);
	if (mask & 0x0000ff)
		bits = 0x0000ff;
	else if (mask & 0x00ff00)
		bits = 0x00ff00;
	else if (mask & 0x0f0000)
		bits = 0x0f0000;
	else
		bits = 0xf00000;

	switch (data[0]) {
	case INSN_CONFIG_DIO_INPUT:
		s->io_bits &= ~bits;
		break;
	case INSN_CONFIG_DIO_OUTPUT:
		s->io_bits |= bits;
		break;
	case INSN_CONFIG_DIO_QUERY:
		data[1] = (s->io_bits & bits) ? COMEDI_OUTPUT : COMEDI_INPUT;
		return insn->n;
		break;
	default:
		return -EINVAL;
	}

	subdev_8255_do_config(dev, s);

	return 1;
}

static int subdev_8255_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 */

	if (err)
		return 4;

	return 0;
}

static int subdev_8255_cmd(struct comedi_device *dev,
			   struct comedi_subdevice *s)
{
	/* FIXME */

	return 0;
}

static int subdev_8255_cancel(struct comedi_device *dev,
			      struct comedi_subdevice *s)
{
	/* FIXME */

	return 0;
}

int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
		     int (*io) (int, int, int, unsigned long),
		     unsigned long iobase)
{
	struct subdev_8255_private *spriv;

	spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
	if (!spriv)
		return -ENOMEM;

	spriv->iobase	= iobase;
	spriv->io	= io ? io : subdev_8255_io;

	s->private	= spriv;

	s->type		= COMEDI_SUBD_DIO;
	s->subdev_flags	= SDF_READABLE | SDF_WRITABLE;
	s->n_chan	= 24;
	s->range_table	= &range_digital;
	s->maxdata	= 1;
	s->insn_bits	= subdev_8255_insn;
	s->insn_config	= subdev_8255_insn_config;

	s->state	= 0;
	s->io_bits	= 0;

	subdev_8255_do_config(dev, s);

	return 0;
}
EXPORT_SYMBOL_GPL(subdev_8255_init);

int subdev_8255_init_irq(struct comedi_device *dev, struct comedi_subdevice *s,
			 int (*io) (int, int, int, unsigned long),
			 unsigned long iobase)
{
	int ret;

	ret = subdev_8255_init(dev, s, io, iobase);
	if (ret)
		return ret;

	s->do_cmdtest	= subdev_8255_cmdtest;
	s->do_cmd	= subdev_8255_cmd;
	s->cancel	= subdev_8255_cancel;

	return 0;
}
EXPORT_SYMBOL_GPL(subdev_8255_init_irq);

/*

   Start of the 8255 standalone device

 */

static int dev_8255_attach(struct comedi_device *dev,
			   struct comedi_devconfig *it)
{
	struct comedi_subdevice *s;
	int ret;
	unsigned long iobase;
	int i;

	for (i = 0; i < COMEDI_NDEVCONFOPTS; i++) {
		iobase = it->options[i];
		if (!iobase)
			break;
	}
	if (i == 0) {
		dev_warn(dev->class_dev, "no devices specified\n");
		return -EINVAL;
	}

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

	for (i = 0; i < dev->n_subdevices; i++) {
		s = &dev->subdevices[i];
		iobase = it->options[i];

		ret = __comedi_request_region(dev, iobase, _8255_SIZE);
		if (ret) {
			s->type = COMEDI_SUBD_UNUSED;
		} else {
			ret = subdev_8255_init(dev, s, NULL, iobase);
			if (ret)
				return ret;
		}
	}

	return 0;
}

static void dev_8255_detach(struct comedi_device *dev)
{
	struct comedi_subdevice *s;
	struct subdev_8255_private *spriv;
	int i;

	for (i = 0; i < dev->n_subdevices; i++) {
		s = &dev->subdevices[i];
		if (s->type != COMEDI_SUBD_UNUSED) {
			spriv = s->private;
			release_region(spriv->iobase, _8255_SIZE);
		}
		comedi_spriv_free(dev, i);
	}
}

static struct comedi_driver dev_8255_driver = {
	.driver_name	= "8255",
	.module		= THIS_MODULE,
	.attach		= dev_8255_attach,
	.detach		= dev_8255_detach,
};
module_comedi_driver(dev_8255_driver);

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
6ca27334 DS	1	/*
	2	comedi/drivers/8255.c
	3	Driver for 8255
	4
	5	COMEDI - Linux Control and Measurement Device Interface
	6	Copyright (C) 1998 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.
6ca27334 DS	17	*/
	18	/*
	19	Driver: 8255
	20	Description: generic 8255 support
	21	Devices: [standard] 8255 (8255)
	22	Author: ds
	23	Status: works
	24	Updated: Fri, 7 Jun 2002 12:56:45 -0700
	25
	26	The classic in digital I/O. The 8255 appears in Comedi as a single
	27	digital I/O subdevice with 24 channels. The channel 0 corresponds
	28	to the 8255's port A, bit 0; channel 23 corresponds to port C, bit
	29	7. Direction configuration is done in blocks, with channels 0-7,
	30	8-15, 16-19, and 20-23 making up the 4 blocks. The only 8255 mode
	31	supported is mode 0.
	32
	33	You should enable compilation this driver if you plan to use a board
	34	that has an 8255 chip. For multifunction boards, the main driver will
	35	configure the 8255 subdevice automatically.
	36
	37	This driver also works independently with ISA and PCI cards that
	38	directly map the 8255 registers to I/O ports, including cards with
	39	multiple 8255 chips. To configure the driver for such a card, the
	40	option list should be a list of the I/O port bases for each of the
	41	8255 chips. For example,
	42
	43	comedi_config /dev/comedi0 8255 0x200,0x204,0x208,0x20c
	44
	45	Note that most PCI 8255 boards do NOT work with this driver, and
	46	need a separate driver as a wrapper. For those that do work, the
	47	I/O port base address can be found in the output of 'lspci -v'.
	48
	49	*/
	50
	51	/*
	52	This file contains an exported subdevice for driving an 8255.
	53
	54	To use this subdevice as part of another driver, you need to
	55	set up the subdevice in the attach function of the driver by
	56	calling:
	57
d29a18dc	58	subdev_8255_init(device, subdevice, io_function, iobase)
6ca27334 DS	59
6ca27334 DS	60	device and subdevice are pointers to the device and subdevice
d29a18dc	61	structures. io_function will be called to provide the
6ca27334	62	low-level input/output to the device, i.e., actual register
d29a18dc	63	access. io_function will be called with the value of iobase
6ca27334	64	as the last parameter. If the 8255 device is mapped as 4
d29a18dc HS	65	consecutive I/O ports, you can use NULL for io_function
d29a18dc HS	66	and the I/O port base for iobase, and an internal function will
6ca27334 DS	67	handle the register access.
	68
	69	In addition, if the main driver handles interrupts, you can
	70	enable commands on the subdevice by calling subdev_8255_init_irq()
	71	instead. Then, when you get an interrupt that is likely to be
	72	from the 8255, you should call subdev_8255_interrupt(), which
	73	will copy the latched value to a Comedi buffer.
	74	*/
	75
	76	#include "../comedidev.h"
	77
	78	#include <linux/ioport.h>
5a0e3ad6	79	#include <linux/slab.h>
27020ffe HS	80
27020ffe HS	81	#include "comedi_fc.h"
c5efe58b	82	#include "8255.h"
6ca27334	83
03ae8189	84	#define _8255_SIZE 4
6ca27334	85
03ae8189 HS	86	#define _8255_DATA 0
03ae8189 HS	87	#define _8255_CR 3
6ca27334 DS	88
	89	#define CR_C_LO_IO 0x01
	90	#define CR_B_IO 0x02
	91	#define CR_B_MODE 0x04
	92	#define CR_C_HI_IO 0x08
	93	#define CR_A_IO 0x10
	94	#define CR_A_MODE(a) ((a)<<5)
	95	#define CR_CW 0x80
	96
a9044d91	97	struct subdev_8255_private {
7a583163 HS	98	unsigned long iobase;
7a583163 HS	99	int (*io) (int, int, int, unsigned long);
6ca27334 DS	100	};
6ca27334 DS	101
f9af899b HS	102	static int subdev_8255_io(int dir, int port, int data, unsigned long iobase)
	103	{
	104	if (dir) {
	105	outb(data, iobase + port);
	106	return 0;
	107	} else {
	108	return inb(iobase + port);
	109	}
	110	}
	111
c5efe58b GKH	112	void subdev_8255_interrupt(struct comedi_device *dev,
c5efe58b GKH	113	struct comedi_subdevice *s)
6ca27334	114	{
7c61452a	115	struct subdev_8255_private *spriv = s->private;
f218d9f5	116	unsigned long iobase = spriv->iobase;
790c5541	117	short d;
6ca27334	118
f218d9f5 HS	119	d = spriv->io(0, _8255_DATA, 0, iobase);
f218d9f5 HS	120	d \|= (spriv->io(0, _8255_DATA + 1, 0, iobase) << 8);
6ca27334 DS	121
	122	comedi_buf_put(s->async, d);
	123	s->async->events \|= COMEDI_CB_EOS;
	124
	125	comedi_event(dev, s);
	126	}
5660e742	127	EXPORT_SYMBOL_GPL(subdev_8255_interrupt);
6ca27334	128
0a85b6f0 MT	129	static int subdev_8255_insn(struct comedi_device *dev,
	130	struct comedi_subdevice *s,
	131	struct comedi_insn insn, unsigned int data)
6ca27334	132	{
7c61452a	133	struct subdev_8255_private *spriv = s->private;
f218d9f5	134	unsigned long iobase = spriv->iobase;
459f299e HS	135	unsigned int mask;
	136	unsigned int bits;
	137	unsigned int v;
7c61452a	138
459f299e HS	139	mask = data[0];
	140	bits = data[1];
	141
	142	if (mask) {
	143	v = s->state;
	144	v &= ~mask;
	145	v \|= (bits & mask);
	146
	147	if (mask & 0xff)
	148	spriv->io(1, _8255_DATA, v & 0xff, iobase);
	149	if (mask & 0xff00)
	150	spriv->io(1, _8255_DATA + 1, (v >> 8) & 0xff, iobase);
	151	if (mask & 0xff0000)
	152	spriv->io(1, _8255_DATA + 2, (v >> 16) & 0xff, iobase);
	153
	154	s->state = v;
6ca27334 DS	155	}
6ca27334 DS	156
459f299e HS	157	v = spriv->io(0, _8255_DATA, 0, iobase);
	158	v \|= (spriv->io(0, _8255_DATA + 1, 0, iobase) << 8);
	159	v \|= (spriv->io(0, _8255_DATA + 2, 0, iobase) << 16);
	160
	161	data[1] = v;
6ca27334	162
459f299e	163	return insn->n;
6ca27334 DS	164	}
6ca27334 DS	165
cf8a6b3d HS	166	static void subdev_8255_do_config(struct comedi_device *dev,
cf8a6b3d HS	167	struct comedi_subdevice *s)
3e699ed1	168	{
7c61452a	169	struct subdev_8255_private *spriv = s->private;
f218d9f5	170	unsigned long iobase = spriv->iobase;
3e699ed1 HS	171	int config;
	172
	173	config = CR_CW;
	174	/* 1 in io_bits indicates output, 1 in config indicates input */
	175	if (!(s->io_bits & 0x0000ff))
	176	config \|= CR_A_IO;
	177	if (!(s->io_bits & 0x00ff00))
	178	config \|= CR_B_IO;
	179	if (!(s->io_bits & 0x0f0000))
	180	config \|= CR_C_LO_IO;
	181	if (!(s->io_bits & 0xf00000))
	182	config \|= CR_C_HI_IO;
f218d9f5 HS	183
f218d9f5 HS	184	spriv->io(1, _8255_CR, config, iobase);
3e699ed1 HS	185	}
3e699ed1 HS	186
0a85b6f0 MT	187	static int subdev_8255_insn_config(struct comedi_device *dev,
	188	struct comedi_subdevice *s,
	189	struct comedi_insn insn, unsigned int data)
6ca27334 DS	190	{
	191	unsigned int mask;
	192	unsigned int bits;
	193
	194	mask = 1 << CR_CHAN(insn->chanspec);
228ec340	195	if (mask & 0x0000ff)
6ca27334	196	bits = 0x0000ff;
228ec340	197	else if (mask & 0x00ff00)
6ca27334	198	bits = 0x00ff00;
228ec340	199	else if (mask & 0x0f0000)
6ca27334	200	bits = 0x0f0000;
228ec340	201	else
6ca27334	202	bits = 0xf00000;
6ca27334 DS	203
	204	switch (data[0]) {
	205	case INSN_CONFIG_DIO_INPUT:
	206	s->io_bits &= ~bits;
	207	break;
	208	case INSN_CONFIG_DIO_OUTPUT:
	209	s->io_bits \|= bits;
	210	break;
	211	case INSN_CONFIG_DIO_QUERY:
	212	data[1] = (s->io_bits & bits) ? COMEDI_OUTPUT : COMEDI_INPUT;
	213	return insn->n;
	214	break;
	215	default:
	216	return -EINVAL;
	217	}
	218
cf8a6b3d	219	subdev_8255_do_config(dev, s);
6ca27334 DS	220
	221	return 1;
	222	}
	223
0a85b6f0 MT	224	static int subdev_8255_cmdtest(struct comedi_device *dev,
	225	struct comedi_subdevice *s,
	226	struct comedi_cmd *cmd)
6ca27334 DS	227	{
6ca27334 DS	228	int err = 0;
6ca27334	229
27020ffe	230	/* Step 1 : check if triggers are trivially valid */
6ca27334	231
27020ffe HS	232	err \|= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
	233	err \|= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
	234	err \|= cfc_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
	235	err \|= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
	236	err \|= cfc_check_trigger_src(&cmd->stop_src, TRIG_NONE);
6ca27334 DS	237
	238	if (err)
	239	return 1;
	240
27020ffe HS	241	/* Step 2a : make sure trigger sources are unique */
27020ffe HS	242	/* Step 2b : and mutually compatible */
6ca27334 DS	243
	244	if (err)
	245	return 2;
	246
851eef80	247	/* Step 3: check if arguments are trivially valid */
6ca27334	248
851eef80 HS	249	err \|= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
	250	err \|= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
	251	err \|= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
	252	err \|= cfc_check_trigger_arg_is(&cmd->scan_end_arg, 1);
	253	err \|= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
6ca27334 DS	254
	255	if (err)
	256	return 3;
	257
	258	/* step 4 */
	259
	260	if (err)
	261	return 4;
	262
	263	return 0;
	264	}
	265
0a85b6f0 MT	266	static int subdev_8255_cmd(struct comedi_device *dev,
0a85b6f0 MT	267	struct comedi_subdevice *s)
6ca27334 DS	268	{
	269	/* FIXME */
	270
	271	return 0;
	272	}
	273
0a85b6f0 MT	274	static int subdev_8255_cancel(struct comedi_device *dev,
0a85b6f0 MT	275	struct comedi_subdevice *s)
6ca27334 DS	276	{
	277	/* FIXME */
	278
	279	return 0;
	280	}
	281
c5efe58b	282	int subdev_8255_init(struct comedi_device dev, struct comedi_subdevice s,
d29a18dc HS	283	int (*io) (int, int, int, unsigned long),
d29a18dc HS	284	unsigned long iobase)
6ca27334	285	{
7c61452a HS	286	struct subdev_8255_private *spriv;
7c61452a HS	287
e64fb55b	288	spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
7c61452a	289	if (!spriv)
6ca27334 DS	290	return -ENOMEM;
6ca27334 DS	291
cc31b1be HS	292	spriv->iobase = iobase;
	293	spriv->io = io ? io : subdev_8255_io;
	294
	295	s->private = spriv;
	296
	297	s->type = COMEDI_SUBD_DIO;
	298	s->subdev_flags = SDF_READABLE \| SDF_WRITABLE;
	299	s->n_chan = 24;
	300	s->range_table = &range_digital;
	301	s->maxdata = 1;
	302	s->insn_bits = subdev_8255_insn;
	303	s->insn_config = subdev_8255_insn_config;
	304
	305	s->state = 0;
	306	s->io_bits = 0;
6ca27334	307
cf8a6b3d	308	subdev_8255_do_config(dev, s);
6ca27334 DS	309
	310	return 0;
	311	}
5660e742	312	EXPORT_SYMBOL_GPL(subdev_8255_init);
6ca27334	313
c5efe58b	314	int subdev_8255_init_irq(struct comedi_device dev, struct comedi_subdevice s,
d29a18dc HS	315	int (*io) (int, int, int, unsigned long),
d29a18dc HS	316	unsigned long iobase)
6ca27334 DS	317	{
	318	int ret;
	319
d29a18dc	320	ret = subdev_8255_init(dev, s, io, iobase);
3e189f08	321	if (ret)
6ca27334 DS	322	return ret;
6ca27334 DS	323
34cfcf9a HS	324	s->do_cmdtest = subdev_8255_cmdtest;
	325	s->do_cmd = subdev_8255_cmd;
	326	s->cancel = subdev_8255_cancel;
6ca27334	327
6ca27334 DS	328	return 0;
6ca27334 DS	329	}
5660e742	330	EXPORT_SYMBOL_GPL(subdev_8255_init_irq);
6ca27334	331
6ca27334 DS	332	/*
	333
	334	Start of the 8255 standalone device
	335
	336	*/
	337
0a85b6f0 MT	338	static int dev_8255_attach(struct comedi_device *dev,
0a85b6f0 MT	339	struct comedi_devconfig *it)
6ca27334	340	{
e40e8375	341	struct comedi_subdevice *s;
6ca27334 DS	342	int ret;
	343	unsigned long iobase;
	344	int i;
	345
6ca27334 DS	346	for (i = 0; i < COMEDI_NDEVCONFOPTS; i++) {
	347	iobase = it->options[i];
	348	if (!iobase)
	349	break;
	350	}
	351	if (i == 0) {
01bd3e3f	352	dev_warn(dev->class_dev, "no devices specified\n");
6ca27334 DS	353	return -EINVAL;
	354	}
	355
2f0b9d08	356	ret = comedi_alloc_subdevices(dev, i);
8b6c5694	357	if (ret)
6ca27334	358	return ret;
02638697	359
6ca27334	360	for (i = 0; i < dev->n_subdevices; i++) {
5101b4d1	361	s = &dev->subdevices[i];
6ca27334 DS	362	iobase = it->options[i];
6ca27334 DS	363
e9720fd2 HS	364	ret = __comedi_request_region(dev, iobase, _8255_SIZE);
e9720fd2 HS	365	if (ret) {
e40e8375	366	s->type = COMEDI_SUBD_UNUSED;
6ca27334	367	} else {
3e189f08 HS	368	ret = subdev_8255_init(dev, s, NULL, iobase);
	369	if (ret)
	370	return ret;
6ca27334 DS	371	}
	372	}
	373
6ca27334 DS	374	return 0;
	375	}
	376
484ecc95	377	static void dev_8255_detach(struct comedi_device *dev)
6ca27334	378	{
34c43922	379	struct comedi_subdevice *s;
7c61452a HS	380	struct subdev_8255_private *spriv;
7c61452a HS	381	int i;
6ca27334	382
6ca27334	383	for (i = 0; i < dev->n_subdevices; i++) {
5101b4d1	384	s = &dev->subdevices[i];
6ca27334	385	if (s->type != COMEDI_SUBD_UNUSED) {
7c61452a	386	spriv = s->private;
7a583163	387	release_region(spriv->iobase, _8255_SIZE);
6ca27334	388	}
2f69915c	389	comedi_spriv_free(dev, i);
6ca27334	390	}
6ca27334	391	}
90f703d3	392
294f930d	393	static struct comedi_driver dev_8255_driver = {
3e699ed1 HS	394	.driver_name = "8255",
	395	.module = THIS_MODULE,
	396	.attach = dev_8255_attach,
	397	.detach = dev_8255_detach,
	398	};
294f930d	399	module_comedi_driver(dev_8255_driver);
3e699ed1	400
90f703d3 AT	401	MODULE_AUTHOR("Comedi http://www.comedi.org");
	402	MODULE_DESCRIPTION("Comedi low-level driver");
	403	MODULE_LICENSE("GPL");