[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 <linux/module.h>
#include "../comedidev.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;
	unsigned short d;

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

	comedi_buf_put(s, 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 v;

	mask = comedi_dio_update_state(s, data);
	if (mask) {
		if (mask & 0xff)
			spriv->io(1, _8255_DATA, s->state & 0xff, iobase);
		if (mask & 0xff00)
			spriv->io(1, _8255_DATA + 1, (s->state >> 8) & 0xff,
				  iobase);
		if (mask & 0xff0000)
			spriv->io(1, _8255_DATA + 2, (s->state >> 16) & 0xff,
				  iobase);
	}

	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 chan = CR_CHAN(insn->chanspec);
	unsigned int mask;
	int ret;

	if (chan < 8)
		mask = 0x0000ff;
	else if (chan < 16)
		mask = 0x00ff00;
	else if (chan < 20)
		mask = 0x0f0000;
	else
		mask = 0xf00000;

	ret = comedi_dio_insn_config(dev, s, insn, data, mask);
	if (ret)
		return ret;

	subdev_8255_do_config(dev, s);

	return insn->n;
}

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, cmd->chanlist_len);
	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 = comedi_alloc_spriv(s, sizeof(*spriv));
	if (!spriv)
		return -ENOMEM;

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

	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;

	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->len_chanlist	= 1;
	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);
		}
	}
}

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
ce157f80	76	#include <linux/module.h>
6ca27334 DS	77	#include "../comedidev.h"
6ca27334 DS	78
27020ffe	79	#include "comedi_fc.h"
c5efe58b	80	#include "8255.h"
6ca27334	81
03ae8189	82	#define _8255_SIZE 4
6ca27334	83
03ae8189 HS	84	#define _8255_DATA 0
03ae8189 HS	85	#define _8255_CR 3
6ca27334 DS	86
	87	#define CR_C_LO_IO 0x01
	88	#define CR_B_IO 0x02
	89	#define CR_B_MODE 0x04
	90	#define CR_C_HI_IO 0x08
	91	#define CR_A_IO 0x10
	92	#define CR_A_MODE(a) ((a)<<5)
	93	#define CR_CW 0x80
	94
a9044d91	95	struct subdev_8255_private {
7a583163	96	unsigned long iobase;
b2815398	97	int (*io)(int, int, int, unsigned long);
6ca27334 DS	98	};
6ca27334 DS	99
f9af899b HS	100	static int subdev_8255_io(int dir, int port, int data, unsigned long iobase)
	101	{
	102	if (dir) {
	103	outb(data, iobase + port);
	104	return 0;
	105	} else {
	106	return inb(iobase + port);
	107	}
	108	}
	109
c5efe58b GKH	110	void subdev_8255_interrupt(struct comedi_device *dev,
c5efe58b GKH	111	struct comedi_subdevice *s)
6ca27334	112	{
7c61452a	113	struct subdev_8255_private *spriv = s->private;
f218d9f5	114	unsigned long iobase = spriv->iobase;
830e273c	115	unsigned short d;
6ca27334	116
f218d9f5 HS	117	d = spriv->io(0, _8255_DATA, 0, iobase);
f218d9f5 HS	118	d \|= (spriv->io(0, _8255_DATA + 1, 0, iobase) << 8);
6ca27334	119
3672effd	120	comedi_buf_put(s, d);
6ca27334 DS	121	s->async->events \|= COMEDI_CB_EOS;
	122
	123	comedi_event(dev, s);
	124	}
5660e742	125	EXPORT_SYMBOL_GPL(subdev_8255_interrupt);
6ca27334	126
0a85b6f0 MT	127	static int subdev_8255_insn(struct comedi_device *dev,
0a85b6f0 MT	128	struct comedi_subdevice *s,
b3ff824a HS	129	struct comedi_insn *insn,
b3ff824a HS	130	unsigned int *data)
6ca27334	131	{
7c61452a	132	struct subdev_8255_private *spriv = s->private;
f218d9f5	133	unsigned long iobase = spriv->iobase;
459f299e	134	unsigned int mask;
459f299e	135	unsigned int v;
7c61452a	136
b3ff824a	137	mask = comedi_dio_update_state(s, data);
459f299e	138	if (mask) {
459f299e	139	if (mask & 0xff)
b3ff824a	140	spriv->io(1, _8255_DATA, s->state & 0xff, iobase);
459f299e	141	if (mask & 0xff00)
b3ff824a HS	142	spriv->io(1, _8255_DATA + 1, (s->state >> 8) & 0xff,
b3ff824a HS	143	iobase);
459f299e	144	if (mask & 0xff0000)
b3ff824a HS	145	spriv->io(1, _8255_DATA + 2, (s->state >> 16) & 0xff,
b3ff824a HS	146	iobase);
6ca27334 DS	147	}
6ca27334 DS	148
459f299e HS	149	v = spriv->io(0, _8255_DATA, 0, iobase);
	150	v \|= (spriv->io(0, _8255_DATA + 1, 0, iobase) << 8);
	151	v \|= (spriv->io(0, _8255_DATA + 2, 0, iobase) << 16);
	152
	153	data[1] = v;
6ca27334	154
459f299e	155	return insn->n;
6ca27334 DS	156	}
6ca27334 DS	157
cf8a6b3d HS	158	static void subdev_8255_do_config(struct comedi_device *dev,
cf8a6b3d HS	159	struct comedi_subdevice *s)
3e699ed1	160	{
7c61452a	161	struct subdev_8255_private *spriv = s->private;
f218d9f5	162	unsigned long iobase = spriv->iobase;
3e699ed1 HS	163	int config;
	164
	165	config = CR_CW;
	166	/* 1 in io_bits indicates output, 1 in config indicates input */
	167	if (!(s->io_bits & 0x0000ff))
	168	config \|= CR_A_IO;
	169	if (!(s->io_bits & 0x00ff00))
	170	config \|= CR_B_IO;
	171	if (!(s->io_bits & 0x0f0000))
	172	config \|= CR_C_LO_IO;
	173	if (!(s->io_bits & 0xf00000))
	174	config \|= CR_C_HI_IO;
f218d9f5 HS	175
f218d9f5 HS	176	spriv->io(1, _8255_CR, config, iobase);
3e699ed1 HS	177	}
3e699ed1 HS	178
0a85b6f0 MT	179	static int subdev_8255_insn_config(struct comedi_device *dev,
0a85b6f0 MT	180	struct comedi_subdevice *s,
5dacadcc HS	181	struct comedi_insn *insn,
5dacadcc HS	182	unsigned int *data)
6ca27334	183	{
5dacadcc	184	unsigned int chan = CR_CHAN(insn->chanspec);
6ca27334	185	unsigned int mask;
5dacadcc HS	186	int ret;
	187
	188	if (chan < 8)
	189	mask = 0x0000ff;
	190	else if (chan < 16)
	191	mask = 0x00ff00;
	192	else if (chan < 20)
	193	mask = 0x0f0000;
3457bfd6	194	else
5dacadcc HS	195	mask = 0xf00000;
	196
	197	ret = comedi_dio_insn_config(dev, s, insn, data, mask);
	198	if (ret)
	199	return ret;
6ca27334	200
cf8a6b3d	201	subdev_8255_do_config(dev, s);
6ca27334	202
5dacadcc	203	return insn->n;
6ca27334 DS	204	}
6ca27334 DS	205
0a85b6f0 MT	206	static int subdev_8255_cmdtest(struct comedi_device *dev,
	207	struct comedi_subdevice *s,
	208	struct comedi_cmd *cmd)
6ca27334 DS	209	{
6ca27334 DS	210	int err = 0;
6ca27334	211
27020ffe	212	/* Step 1 : check if triggers are trivially valid */
6ca27334	213
27020ffe HS	214	err \|= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
	215	err \|= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
	216	err \|= cfc_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
	217	err \|= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
	218	err \|= cfc_check_trigger_src(&cmd->stop_src, TRIG_NONE);
6ca27334 DS	219
	220	if (err)
	221	return 1;
	222
27020ffe HS	223	/* Step 2a : make sure trigger sources are unique */
27020ffe HS	224	/* Step 2b : and mutually compatible */
6ca27334 DS	225
	226	if (err)
	227	return 2;
	228
851eef80	229	/* Step 3: check if arguments are trivially valid */
6ca27334	230
851eef80 HS	231	err \|= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
	232	err \|= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
	233	err \|= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
f50cebb9	234	err \|= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
851eef80	235	err \|= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
6ca27334 DS	236
	237	if (err)
	238	return 3;
	239
	240	/* step 4 */
	241
	242	if (err)
	243	return 4;
	244
	245	return 0;
	246	}
	247
0a85b6f0 MT	248	static int subdev_8255_cmd(struct comedi_device *dev,
0a85b6f0 MT	249	struct comedi_subdevice *s)
6ca27334 DS	250	{
	251	/* FIXME */
	252
	253	return 0;
	254	}
	255
0a85b6f0 MT	256	static int subdev_8255_cancel(struct comedi_device *dev,
0a85b6f0 MT	257	struct comedi_subdevice *s)
6ca27334 DS	258	{
	259	/* FIXME */
	260
	261	return 0;
	262	}
	263
c5efe58b	264	int subdev_8255_init(struct comedi_device dev, struct comedi_subdevice s,
b2815398	265	int (*io)(int, int, int, unsigned long),
d29a18dc	266	unsigned long iobase)
6ca27334	267	{
7c61452a HS	268	struct subdev_8255_private *spriv;
7c61452a HS	269
0480bcb9	270	spriv = comedi_alloc_spriv(s, sizeof(*spriv));
7c61452a	271	if (!spriv)
6ca27334 DS	272	return -ENOMEM;
6ca27334 DS	273
cc31b1be HS	274	spriv->iobase = iobase;
	275	spriv->io = io ? io : subdev_8255_io;
	276
cc31b1be HS	277	s->type = COMEDI_SUBD_DIO;
	278	s->subdev_flags = SDF_READABLE \| SDF_WRITABLE;
	279	s->n_chan = 24;
	280	s->range_table = &range_digital;
	281	s->maxdata = 1;
	282	s->insn_bits = subdev_8255_insn;
	283	s->insn_config = subdev_8255_insn_config;
	284
cf8a6b3d	285	subdev_8255_do_config(dev, s);
6ca27334 DS	286
	287	return 0;
	288	}
5660e742	289	EXPORT_SYMBOL_GPL(subdev_8255_init);
6ca27334	290
c5efe58b	291	int subdev_8255_init_irq(struct comedi_device dev, struct comedi_subdevice s,
b2815398	292	int (*io)(int, int, int, unsigned long),
d29a18dc	293	unsigned long iobase)
6ca27334 DS	294	{
	295	int ret;
	296
d29a18dc	297	ret = subdev_8255_init(dev, s, io, iobase);
3e189f08	298	if (ret)
6ca27334 DS	299	return ret;
6ca27334 DS	300
f50cebb9	301	s->len_chanlist = 1;
34cfcf9a HS	302	s->do_cmdtest = subdev_8255_cmdtest;
	303	s->do_cmd = subdev_8255_cmd;
	304	s->cancel = subdev_8255_cancel;
6ca27334	305
6ca27334 DS	306	return 0;
6ca27334 DS	307	}
5660e742	308	EXPORT_SYMBOL_GPL(subdev_8255_init_irq);
6ca27334	309
6ca27334 DS	310	/*
	311
	312	Start of the 8255 standalone device
	313
	314	*/
	315
0a85b6f0 MT	316	static int dev_8255_attach(struct comedi_device *dev,
0a85b6f0 MT	317	struct comedi_devconfig *it)
6ca27334	318	{
e40e8375	319	struct comedi_subdevice *s;
6ca27334 DS	320	int ret;
	321	unsigned long iobase;
	322	int i;
	323
6ca27334 DS	324	for (i = 0; i < COMEDI_NDEVCONFOPTS; i++) {
	325	iobase = it->options[i];
	326	if (!iobase)
	327	break;
	328	}
	329	if (i == 0) {
01bd3e3f	330	dev_warn(dev->class_dev, "no devices specified\n");
6ca27334 DS	331	return -EINVAL;
	332	}
	333
2f0b9d08	334	ret = comedi_alloc_subdevices(dev, i);
8b6c5694	335	if (ret)
6ca27334	336	return ret;
02638697	337
6ca27334	338	for (i = 0; i < dev->n_subdevices; i++) {
5101b4d1	339	s = &dev->subdevices[i];
6ca27334 DS	340	iobase = it->options[i];
6ca27334 DS	341
e9720fd2 HS	342	ret = __comedi_request_region(dev, iobase, _8255_SIZE);
e9720fd2 HS	343	if (ret) {
e40e8375	344	s->type = COMEDI_SUBD_UNUSED;
6ca27334	345	} else {
3e189f08 HS	346	ret = subdev_8255_init(dev, s, NULL, iobase);
	347	if (ret)
	348	return ret;
6ca27334 DS	349	}
	350	}
	351
6ca27334 DS	352	return 0;
	353	}
	354
484ecc95	355	static void dev_8255_detach(struct comedi_device *dev)
6ca27334	356	{
34c43922	357	struct comedi_subdevice *s;
7c61452a HS	358	struct subdev_8255_private *spriv;
7c61452a HS	359	int i;
6ca27334	360
6ca27334	361	for (i = 0; i < dev->n_subdevices; i++) {
5101b4d1	362	s = &dev->subdevices[i];
6ca27334	363	if (s->type != COMEDI_SUBD_UNUSED) {
7c61452a	364	spriv = s->private;
7a583163	365	release_region(spriv->iobase, _8255_SIZE);
6ca27334	366	}
6ca27334	367	}
6ca27334	368	}
90f703d3	369
294f930d	370	static struct comedi_driver dev_8255_driver = {
3e699ed1 HS	371	.driver_name = "8255",
	372	.module = THIS_MODULE,
	373	.attach = dev_8255_attach,
	374	.detach = dev_8255_detach,
	375	};
294f930d	376	module_comedi_driver(dev_8255_driver);
3e699ed1	377
90f703d3 AT	378	MODULE_AUTHOR("Comedi http://www.comedi.org");
	379	MODULE_DESCRIPTION("Comedi low-level driver");
	380	MODULE_LICENSE("GPL");