[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.

    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: 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, callback_function, arg)

   device and subdevice are pointers to the device and subdevice
   structures.  callback_function will be called to provide the
   low-level input/output to the device, i.e., actual register
   access.  callback_function will be called with the value of arg
   as the last parameter.  If the 8255 device is mapped as 4
   consecutive I/O ports, you can use NULL for callback_function
   and the I/O port base for arg, 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 "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_struct {
	unsigned long cb_arg;
	int (*cb_func) (int, int, int, unsigned long);
	int have_irq;
};

#define CALLBACK_ARG	(((struct subdev_8255_struct *)s->private)->cb_arg)
#define CALLBACK_FUNC	(((struct subdev_8255_struct *)s->private)->cb_func)
#define subdevpriv	((struct subdev_8255_struct *)s->private)

void subdev_8255_interrupt(struct comedi_device *dev,
			   struct comedi_subdevice *s)
{
	short d;

	d = CALLBACK_FUNC(0, _8255_DATA, 0, CALLBACK_ARG);
	d |= (CALLBACK_FUNC(0, _8255_DATA + 1, 0, CALLBACK_ARG) << 8);

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

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

static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
{
	unsigned long iobase = arg;

	if (dir) {
		outb(data, iobase + port);
		return 0;
	} else {
		return inb(iobase + port);
	}
}

static int subdev_8255_insn(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data)
{
	if (data[0]) {
		s->state &= ~data[0];
		s->state |= (data[0] & data[1]);

		if (data[0] & 0xff)
			CALLBACK_FUNC(1, _8255_DATA, s->state & 0xff,
				      CALLBACK_ARG);
		if (data[0] & 0xff00)
			CALLBACK_FUNC(1, _8255_DATA + 1, (s->state >> 8) & 0xff,
				      CALLBACK_ARG);
		if (data[0] & 0xff0000)
			CALLBACK_FUNC(1, _8255_DATA + 2,
				      (s->state >> 16) & 0xff, CALLBACK_ARG);
	}

	data[1] = CALLBACK_FUNC(0, _8255_DATA, 0, CALLBACK_ARG);
	data[1] |= (CALLBACK_FUNC(0, _8255_DATA + 1, 0, CALLBACK_ARG) << 8);
	data[1] |= (CALLBACK_FUNC(0, _8255_DATA + 2, 0, CALLBACK_ARG) << 16);

	return 2;
}

static void do_config(struct comedi_device *dev, struct comedi_subdevice *s)
{
	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;
	CALLBACK_FUNC(1, _8255_CR, config, CALLBACK_ARG);
}

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;
	}

	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;
	unsigned 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 */

	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 */

	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 (*cb) (int, int, int, unsigned long),
		     unsigned long arg)
{
	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->private = kmalloc(sizeof(struct subdev_8255_struct), GFP_KERNEL);
	if (!s->private)
		return -ENOMEM;

	CALLBACK_ARG = arg;
	if (cb == NULL)
		CALLBACK_FUNC = subdev_8255_cb;
	else
		CALLBACK_FUNC = cb;
	s->insn_bits = subdev_8255_insn;
	s->insn_config = subdev_8255_insn_config;

	s->state = 0;
	s->io_bits = 0;
	do_config(dev, s);

	return 0;
}
EXPORT_SYMBOL(subdev_8255_init);

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

	ret = subdev_8255_init(dev, s, cb, arg);
	if (ret < 0)
		return ret;

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

	subdevpriv->have_irq = 1;

	return 0;
}
EXPORT_SYMBOL(subdev_8255_init_irq);

void subdev_8255_cleanup(struct comedi_device *dev, struct comedi_subdevice *s)
{
	kfree(s->private);
}
EXPORT_SYMBOL(subdev_8255_cleanup);

/*

   Start of the 8255 standalone device

 */

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

	dev->board_name = "8255";

	for (i = 0; i < COMEDI_NDEVCONFOPTS; i++) {
		iobase = it->options[i];
		if (!iobase)
			break;
	}
	if (i == 0) {
		printk(KERN_WARNING
		       "comedi%d: 8255: no devices specified\n", dev->minor);
		return -EINVAL;
	}

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

	printk(KERN_INFO "comedi%d: 8255:", dev->minor);

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

		printk(" 0x%04lx", iobase);
		if (!request_region(iobase, _8255_SIZE, "8255")) {
			printk(" (I/O port conflict)");

			dev->subdevices[i].type = COMEDI_SUBD_UNUSED;
		} else {
			subdev_8255_init(dev, dev->subdevices + i, NULL,
					 iobase);
		}
	}

	printk("\n");

	return 0;
}

static void dev_8255_detach(struct comedi_device *dev)
{
	int i;
	unsigned long iobase;
	struct comedi_subdevice *s;

	for (i = 0; i < dev->n_subdevices; i++) {
		s = dev->subdevices + i;
		if (s->type != COMEDI_SUBD_UNUSED) {
			iobase = CALLBACK_ARG;
			release_region(iobase, _8255_SIZE);
		}
		subdev_8255_cleanup(dev, s);
	}
}

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.
	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: 8255
	25	Description: generic 8255 support
	26	Devices: [standard] 8255 (8255)
	27	Author: ds
	28	Status: works
	29	Updated: Fri, 7 Jun 2002 12:56:45 -0700
	30
	31	The classic in digital I/O. The 8255 appears in Comedi as a single
	32	digital I/O subdevice with 24 channels. The channel 0 corresponds
	33	to the 8255's port A, bit 0; channel 23 corresponds to port C, bit
	34	7. Direction configuration is done in blocks, with channels 0-7,
	35	8-15, 16-19, and 20-23 making up the 4 blocks. The only 8255 mode
	36	supported is mode 0.
	37
	38	You should enable compilation this driver if you plan to use a board
	39	that has an 8255 chip. For multifunction boards, the main driver will
	40	configure the 8255 subdevice automatically.
	41
	42	This driver also works independently with ISA and PCI cards that
	43	directly map the 8255 registers to I/O ports, including cards with
	44	multiple 8255 chips. To configure the driver for such a card, the
	45	option list should be a list of the I/O port bases for each of the
	46	8255 chips. For example,
	47
	48	comedi_config /dev/comedi0 8255 0x200,0x204,0x208,0x20c
	49
	50	Note that most PCI 8255 boards do NOT work with this driver, and
	51	need a separate driver as a wrapper. For those that do work, the
	52	I/O port base address can be found in the output of 'lspci -v'.
	53
	54	*/
	55
	56	/*
	57	This file contains an exported subdevice for driving an 8255.
	58
	59	To use this subdevice as part of another driver, you need to
	60	set up the subdevice in the attach function of the driver by
	61	calling:
	62
	63	subdev_8255_init(device, subdevice, callback_function, arg)
	64
65	device and subdevice are pointers to the device and subdevice
66	structures. callback_function will be called to provide the
67	low-level input/output to the device, i.e., actual register
68	access. callback_function will be called with the value of arg
69	as the last parameter. If the 8255 device is mapped as 4
70	consecutive I/O ports, you can use NULL for callback_function
71	and the I/O port base for arg, and an internal function will
72	handle the register access.
73
74	In addition, if the main driver handles interrupts, you can
75	enable commands on the subdevice by calling subdev_8255_init_irq()
76	instead. Then, when you get an interrupt that is likely to be
77	from the 8255, you should call subdev_8255_interrupt(), which
78	will copy the latched value to a Comedi buffer.
79	*/
80
81	#include "../comedidev.h"
82
83	#include <linux/ioport.h>
5a0e3ad6	84	#include <linux/slab.h>
c5efe58b	85	#include "8255.h"
6ca27334 DS	86
	87	#define _8255_SIZE 4
	88
	89	#define _8255_DATA 0
	90	#define _8255_CR 3
	91
	92	#define CR_C_LO_IO 0x01
	93	#define CR_B_IO 0x02
	94	#define CR_B_MODE 0x04
	95	#define CR_C_HI_IO 0x08
	96	#define CR_A_IO 0x10
	97	#define CR_A_MODE(a) ((a)<<5)
	98	#define CR_CW 0x80
	99
	100	struct subdev_8255_struct {
	101	unsigned long cb_arg;
	102	int (*cb_func) (int, int, int, unsigned long);
	103	int have_irq;
	104	};
	105
	106	#define CALLBACK_ARG (((struct subdev_8255_struct *)s->private)->cb_arg)
	107	#define CALLBACK_FUNC (((struct subdev_8255_struct *)s->private)->cb_func)
	108	#define subdevpriv ((struct subdev_8255_struct *)s->private)
	109
c5efe58b GKH	110	void subdev_8255_interrupt(struct comedi_device *dev,
c5efe58b GKH	111	struct comedi_subdevice *s)
6ca27334	112	{
790c5541	113	short d;
6ca27334 DS	114
	115	d = CALLBACK_FUNC(0, _8255_DATA, 0, CALLBACK_ARG);
	116	d \|= (CALLBACK_FUNC(0, _8255_DATA + 1, 0, CALLBACK_ARG) << 8);
	117
	118	comedi_buf_put(s->async, d);
	119	s->async->events \|= COMEDI_CB_EOS;
	120
	121	comedi_event(dev, s);
	122	}
228ec340	123	EXPORT_SYMBOL(subdev_8255_interrupt);
6ca27334 DS	124
	125	static int subdev_8255_cb(int dir, int port, int data, unsigned long arg)
	126	{
	127	unsigned long iobase = arg;
	128
	129	if (dir) {
	130	outb(data, iobase + port);
	131	return 0;
	132	} else {
	133	return inb(iobase + port);
	134	}
	135	}
	136
0a85b6f0 MT	137	static int subdev_8255_insn(struct comedi_device *dev,
	138	struct comedi_subdevice *s,
	139	struct comedi_insn insn, unsigned int data)
6ca27334 DS	140	{
	141	if (data[0]) {
	142	s->state &= ~data[0];
	143	s->state \|= (data[0] & data[1]);
	144
	145	if (data[0] & 0xff)
	146	CALLBACK_FUNC(1, _8255_DATA, s->state & 0xff,
0a85b6f0	147	CALLBACK_ARG);
6ca27334 DS	148	if (data[0] & 0xff00)
6ca27334 DS	149	CALLBACK_FUNC(1, _8255_DATA + 1, (s->state >> 8) & 0xff,
0a85b6f0	150	CALLBACK_ARG);
6ca27334 DS	151	if (data[0] & 0xff0000)
6ca27334 DS	152	CALLBACK_FUNC(1, _8255_DATA + 2,
0a85b6f0	153	(s->state >> 16) & 0xff, CALLBACK_ARG);
6ca27334 DS	154	}
	155
	156	data[1] = CALLBACK_FUNC(0, _8255_DATA, 0, CALLBACK_ARG);
	157	data[1] \|= (CALLBACK_FUNC(0, _8255_DATA + 1, 0, CALLBACK_ARG) << 8);
	158	data[1] \|= (CALLBACK_FUNC(0, _8255_DATA + 2, 0, CALLBACK_ARG) << 16);
	159
	160	return 2;
	161	}
	162
3e699ed1 HS	163	static void do_config(struct comedi_device dev, struct comedi_subdevice s)
	164	{
	165	int config;
	166
	167	config = CR_CW;
	168	/* 1 in io_bits indicates output, 1 in config indicates input */
	169	if (!(s->io_bits & 0x0000ff))
	170	config \|= CR_A_IO;
	171	if (!(s->io_bits & 0x00ff00))
	172	config \|= CR_B_IO;
	173	if (!(s->io_bits & 0x0f0000))
	174	config \|= CR_C_LO_IO;
	175	if (!(s->io_bits & 0xf00000))
	176	config \|= CR_C_HI_IO;
	177	CALLBACK_FUNC(1, _8255_CR, config, CALLBACK_ARG);
	178	}
	179
0a85b6f0 MT	180	static int subdev_8255_insn_config(struct comedi_device *dev,
	181	struct comedi_subdevice *s,
	182	struct comedi_insn insn, unsigned int data)
6ca27334 DS	183	{
	184	unsigned int mask;
	185	unsigned int bits;
	186
	187	mask = 1 << CR_CHAN(insn->chanspec);
228ec340	188	if (mask & 0x0000ff)
6ca27334	189	bits = 0x0000ff;
228ec340	190	else if (mask & 0x00ff00)
6ca27334	191	bits = 0x00ff00;
228ec340	192	else if (mask & 0x0f0000)
6ca27334	193	bits = 0x0f0000;
228ec340	194	else
6ca27334	195	bits = 0xf00000;
6ca27334 DS	196
	197	switch (data[0]) {
	198	case INSN_CONFIG_DIO_INPUT:
	199	s->io_bits &= ~bits;
	200	break;
	201	case INSN_CONFIG_DIO_OUTPUT:
	202	s->io_bits \|= bits;
	203	break;
	204	case INSN_CONFIG_DIO_QUERY:
	205	data[1] = (s->io_bits & bits) ? COMEDI_OUTPUT : COMEDI_INPUT;
	206	return insn->n;
	207	break;
	208	default:
	209	return -EINVAL;
	210	}
	211
	212	do_config(dev, s);
	213
	214	return 1;
	215	}
	216
0a85b6f0 MT	217	static int subdev_8255_cmdtest(struct comedi_device *dev,
	218	struct comedi_subdevice *s,
	219	struct comedi_cmd *cmd)
6ca27334 DS	220	{
	221	int err = 0;
	222	unsigned int tmp;
	223
	224	/* step 1 */
	225
	226	tmp = cmd->start_src;
	227	cmd->start_src &= TRIG_NOW;
	228	if (!cmd->start_src \|\| tmp != cmd->start_src)
	229	err++;
	230
	231	tmp = cmd->scan_begin_src;
	232	cmd->scan_begin_src &= TRIG_EXT;
	233	if (!cmd->scan_begin_src \|\| tmp != cmd->scan_begin_src)
	234	err++;
	235
	236	tmp = cmd->convert_src;
	237	cmd->convert_src &= TRIG_FOLLOW;
	238	if (!cmd->convert_src \|\| tmp != cmd->convert_src)
	239	err++;
	240
	241	tmp = cmd->scan_end_src;
	242	cmd->scan_end_src &= TRIG_COUNT;
	243	if (!cmd->scan_end_src \|\| tmp != cmd->scan_end_src)
	244	err++;
	245
	246	tmp = cmd->stop_src;
	247	cmd->stop_src &= TRIG_NONE;
	248	if (!cmd->stop_src \|\| tmp != cmd->stop_src)
	249	err++;
	250
	251	if (err)
	252	return 1;
	253
	254	/* step 2 */
	255
	256	if (err)
	257	return 2;
	258
	259	/* step 3 */
	260
	261	if (cmd->start_arg != 0) {
	262	cmd->start_arg = 0;
	263	err++;
	264	}
	265	if (cmd->scan_begin_arg != 0) {
	266	cmd->scan_begin_arg = 0;
	267	err++;
	268	}
	269	if (cmd->convert_arg != 0) {
	270	cmd->convert_arg = 0;
	271	err++;
	272	}
	273	if (cmd->scan_end_arg != 1) {
	274	cmd->scan_end_arg = 1;
	275	err++;
	276	}
	277	if (cmd->stop_arg != 0) {
	278	cmd->stop_arg = 0;
	279	err++;
	280	}
	281
	282	if (err)
	283	return 3;
284
285	/* step 4 */
286
287	if (err)
288	return 4;
289
290	return 0;
291	}
292
0a85b6f0 MT	293	static int subdev_8255_cmd(struct comedi_device *dev,
0a85b6f0 MT	294	struct comedi_subdevice *s)
6ca27334 DS	295	{
	296	/* FIXME */
	297
	298	return 0;
	299	}
	300
0a85b6f0 MT	301	static int subdev_8255_cancel(struct comedi_device *dev,
0a85b6f0 MT	302	struct comedi_subdevice *s)
6ca27334 DS	303	{
	304	/* FIXME */
	305
	306	return 0;
	307	}
	308
c5efe58b GKH	309	int subdev_8255_init(struct comedi_device dev, struct comedi_subdevice s,
	310	int (*cb) (int, int, int, unsigned long),
	311	unsigned long arg)
6ca27334 DS	312	{
	313	s->type = COMEDI_SUBD_DIO;
	314	s->subdev_flags = SDF_READABLE \| SDF_WRITABLE;
	315	s->n_chan = 24;
	316	s->range_table = &range_digital;
	317	s->maxdata = 1;
	318
	319	s->private = kmalloc(sizeof(struct subdev_8255_struct), GFP_KERNEL);
	320	if (!s->private)
	321	return -ENOMEM;
	322
	323	CALLBACK_ARG = arg;
228ec340	324	if (cb == NULL)
6ca27334	325	CALLBACK_FUNC = subdev_8255_cb;
228ec340	326	else
6ca27334	327	CALLBACK_FUNC = cb;
6ca27334 DS	328	s->insn_bits = subdev_8255_insn;
	329	s->insn_config = subdev_8255_insn_config;
	330
	331	s->state = 0;
	332	s->io_bits = 0;
	333	do_config(dev, s);
	334
	335	return 0;
	336	}
228ec340	337	EXPORT_SYMBOL(subdev_8255_init);
6ca27334	338
c5efe58b GKH	339	int subdev_8255_init_irq(struct comedi_device dev, struct comedi_subdevice s,
	340	int (*cb) (int, int, int, unsigned long),
	341	unsigned long arg)
6ca27334 DS	342	{
	343	int ret;
	344
	345	ret = subdev_8255_init(dev, s, cb, arg);
	346	if (ret < 0)
	347	return ret;
	348
	349	s->do_cmdtest = subdev_8255_cmdtest;
	350	s->do_cmd = subdev_8255_cmd;
	351	s->cancel = subdev_8255_cancel;
	352
	353	subdevpriv->have_irq = 1;
	354
	355	return 0;
	356	}
228ec340	357	EXPORT_SYMBOL(subdev_8255_init_irq);
6ca27334	358
c5efe58b	359	void subdev_8255_cleanup(struct comedi_device dev, struct comedi_subdevice s)
6ca27334	360	{
e4e1f289	361	kfree(s->private);
6ca27334	362	}
228ec340	363	EXPORT_SYMBOL(subdev_8255_cleanup);
6ca27334 DS	364
	365	/*
	366
	367	Start of the 8255 standalone device
	368
	369	*/
	370
0a85b6f0 MT	371	static int dev_8255_attach(struct comedi_device *dev,
0a85b6f0 MT	372	struct comedi_devconfig *it)
6ca27334 DS	373	{
	374	int ret;
	375	unsigned long iobase;
	376	int i;
	377
6ca27334 DS	378	dev->board_name = "8255";
	379
	380	for (i = 0; i < COMEDI_NDEVCONFOPTS; i++) {
	381	iobase = it->options[i];
	382	if (!iobase)
	383	break;
	384	}
	385	if (i == 0) {
02638697 M	386	printk(KERN_WARNING
02638697 M	387	"comedi%d: 8255: no devices specified\n", dev->minor);
6ca27334 DS	388	return -EINVAL;
	389	}
	390
2f0b9d08	391	ret = comedi_alloc_subdevices(dev, i);
8b6c5694	392	if (ret)
6ca27334	393	return ret;
02638697 M	394
02638697 M	395	printk(KERN_INFO "comedi%d: 8255:", dev->minor);
6ca27334 DS	396
	397	for (i = 0; i < dev->n_subdevices; i++) {
	398	iobase = it->options[i];
	399
	400	printk(" 0x%04lx", iobase);
	401	if (!request_region(iobase, _8255_SIZE, "8255")) {
	402	printk(" (I/O port conflict)");
	403
	404	dev->subdevices[i].type = COMEDI_SUBD_UNUSED;
	405	} else {
	406	subdev_8255_init(dev, dev->subdevices + i, NULL,
0a85b6f0	407	iobase);
6ca27334 DS	408	}
	409	}
	410
	411	printk("\n");
	412
	413	return 0;
	414	}
	415
484ecc95	416	static void dev_8255_detach(struct comedi_device *dev)
6ca27334 DS	417	{
	418	int i;
	419	unsigned long iobase;
34c43922	420	struct comedi_subdevice *s;
6ca27334	421
6ca27334 DS	422	for (i = 0; i < dev->n_subdevices; i++) {
	423	s = dev->subdevices + i;
	424	if (s->type != COMEDI_SUBD_UNUSED) {
	425	iobase = CALLBACK_ARG;
	426	release_region(iobase, _8255_SIZE);
	427	}
	428	subdev_8255_cleanup(dev, s);
	429	}
6ca27334	430	}
90f703d3	431
294f930d	432	static struct comedi_driver dev_8255_driver = {
3e699ed1 HS	433	.driver_name = "8255",
	434	.module = THIS_MODULE,
	435	.attach = dev_8255_attach,
	436	.detach = dev_8255_detach,
	437	};
294f930d	438	module_comedi_driver(dev_8255_driver);
3e699ed1	439
90f703d3 AT	440	MODULE_AUTHOR("Comedi http://www.comedi.org");
	441	MODULE_DESCRIPTION("Comedi low-level driver");
	442	MODULE_LICENSE("GPL");