[linux-2.6-block.git] / drivers / staging / comedi / drivers / pcmad.c

/*
 * pcmad.c
 * Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 2000,2001 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.
 */

/*
 * Driver: pcmad
 * Description: Winsystems PCM-A/D12, PCM-A/D16
 * Devices: [Winsystems] PCM-A/D12 (pcmad12), PCM-A/D16 (pcmad16)
 * Author: ds
 * Status: untested
 *
 * This driver was written on a bet that I couldn't write a driver
 * in less than 2 hours.  I won the bet, but never got paid.  =(
 *
 * Configuration options:
 *   [0] - I/O port base
 *   [1] - IRQ (unused)
 *   [2] - Analog input reference (must match jumpers)
 *	   0 = single-ended (16 channels)
 *	   1 = differential (8 channels)
 *   [3] - Analog input encoding (must match jumpers)
 *	   0 = straight binary (0-5V input range)
 *	   1 = two's complement (+-10V input range)
 */

#include <linux/module.h>
#include "../comedidev.h"

#define PCMAD_STATUS		0
#define PCMAD_LSB		1
#define PCMAD_MSB		2
#define PCMAD_CONVERT		1

struct pcmad_board_struct {
	const char *name;
	unsigned int ai_maxdata;
};

static const struct pcmad_board_struct pcmad_boards[] = {
	{
		.name		= "pcmad12",
		.ai_maxdata	= 0x0fff,
	}, {
		.name		= "pcmad16",
		.ai_maxdata	= 0xffff,
	},
};

static int pcmad_ai_eoc(struct comedi_device *dev,
			struct comedi_subdevice *s,
			struct comedi_insn *insn,
			unsigned long context)
{
	unsigned int status;

	status = inb(dev->iobase + PCMAD_STATUS);
	if ((status & 0x3) == 0x3)
		return 0;
	return -EBUSY;
}

static int pcmad_ai_insn_read(struct comedi_device *dev,
			      struct comedi_subdevice *s,
			      struct comedi_insn *insn,
			      unsigned int *data)
{
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int range = CR_RANGE(insn->chanspec);
	unsigned int val;
	int ret;
	int i;

	for (i = 0; i < insn->n; i++) {
		outb(chan, dev->iobase + PCMAD_CONVERT);

		ret = comedi_timeout(dev, s, insn, pcmad_ai_eoc, 0);
		if (ret)
			return ret;

		val = inb(dev->iobase + PCMAD_LSB) |
		      (inb(dev->iobase + PCMAD_MSB) << 8);

		/* data is shifted on the pcmad12, fix it */
		if (s->maxdata == 0x0fff)
			val >>= 4;

		if (comedi_range_is_bipolar(s, range)) {
			/* munge the two's complement value */
			val ^= ((s->maxdata + 1) >> 1);
		}

		data[i] = val;
	}

	return insn->n;
}

static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
	const struct pcmad_board_struct *board = dev->board_ptr;
	struct comedi_subdevice *s;
	int ret;

	ret = comedi_request_region(dev, it->options[0], 0x04);
	if (ret)
		return ret;

	ret = comedi_alloc_subdevices(dev, 1);
	if (ret)
		return ret;

	s = &dev->subdevices[0];
	s->type		= COMEDI_SUBD_AI;
	if (it->options[1]) {
		/* 8 differential channels */
		s->subdev_flags	= SDF_READABLE | AREF_DIFF;
		s->n_chan	= 8;
	} else {
		/* 16 single-ended channels */
		s->subdev_flags	= SDF_READABLE | AREF_GROUND;
		s->n_chan	= 16;
	}
	s->len_chanlist	= 1;
	s->maxdata	= board->ai_maxdata;
	s->range_table	= it->options[2] ? &range_bipolar10 : &range_unipolar5;
	s->insn_read	= pcmad_ai_insn_read;

	return 0;
}

static struct comedi_driver pcmad_driver = {
	.driver_name	= "pcmad",
	.module		= THIS_MODULE,
	.attach		= pcmad_attach,
	.detach		= comedi_legacy_detach,
	.board_name	= &pcmad_boards[0].name,
	.num_names	= ARRAY_SIZE(pcmad_boards),
	.offset		= sizeof(pcmad_boards[0]),
};
module_comedi_driver(pcmad_driver);

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
58e732ee	1	/*
06d4bd51 HS	2	* pcmad.c
	3	* Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16
	4	*
	5	* COMEDI - Linux Control and Measurement Device Interface
	6	* Copyright (C) 2000,2001 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	*/
58e732ee	18
58e732ee	19	/*
06d4bd51 HS	20	* Driver: pcmad
06d4bd51 HS	21	* Description: Winsystems PCM-A/D12, PCM-A/D16
f15ceb48	22	* Devices: [Winsystems] PCM-A/D12 (pcmad12), PCM-A/D16 (pcmad16)
06d4bd51 HS	23	* Author: ds
	24	* Status: untested
	25	*
	26	* This driver was written on a bet that I couldn't write a driver
	27	* in less than 2 hours. I won the bet, but never got paid. =(
	28	*
	29	* Configuration options:
	30	* [0] - I/O port base
	31	* [1] - IRQ (unused)
6092e942 HS	32	* [2] - Analog input reference (must match jumpers)
	33	* 0 = single-ended (16 channels)
	34	* 1 = differential (8 channels)
06d4bd51	35	* [3] - Analog input encoding (must match jumpers)
7ecc5370 HS	36	* 0 = straight binary (0-5V input range)
7ecc5370 HS	37	* 1 = two's complement (+-10V input range)
06d4bd51	38	*/
58e732ee	39
ce157f80	40	#include <linux/module.h>
58e732ee DS	41	#include "../comedidev.h"
58e732ee DS	42
58e732ee DS	43	#define PCMAD_STATUS 0
	44	#define PCMAD_LSB 1
	45	#define PCMAD_MSB 2
	46	#define PCMAD_CONVERT 1
	47
	48	struct pcmad_board_struct {
	49	const char *name;
d69b55f3	50	unsigned int ai_maxdata;
58e732ee	51	};
58e732ee	52
2a09cba6 HS	53	static const struct pcmad_board_struct pcmad_boards[] = {
	54	{
	55	.name = "pcmad12",
d69b55f3	56	.ai_maxdata = 0x0fff,
2a09cba6 HS	57	}, {
2a09cba6 HS	58	.name = "pcmad16",
d69b55f3	59	.ai_maxdata = 0xffff,
2a09cba6 HS	60	},
	61	};
	62
42946cfc HS	63	static int pcmad_ai_eoc(struct comedi_device *dev,
	64	struct comedi_subdevice *s,
	65	struct comedi_insn *insn,
	66	unsigned long context)
bcc01b4d	67	{
42946cfc	68	unsigned int status;
bcc01b4d	69
42946cfc HS	70	status = inb(dev->iobase + PCMAD_STATUS);
	71	if ((status & 0x3) == 0x3)
	72	return 0;
	73	return -EBUSY;
bcc01b4d HS	74	}
bcc01b4d HS	75
0a85b6f0 MT	76	static int pcmad_ai_insn_read(struct comedi_device *dev,
0a85b6f0 MT	77	struct comedi_subdevice *s,
3275b4d3 HS	78	struct comedi_insn *insn,
3275b4d3 HS	79	unsigned int *data)
58e732ee	80	{
3275b4d3	81	unsigned int chan = CR_CHAN(insn->chanspec);
7ecc5370	82	unsigned int range = CR_RANGE(insn->chanspec);
3275b4d3	83	unsigned int val;
bcc01b4d	84	int ret;
3275b4d3	85	int i;
58e732ee	86
3275b4d3	87	for (i = 0; i < insn->n; i++) {
58e732ee DS	88	outb(chan, dev->iobase + PCMAD_CONVERT);
58e732ee DS	89
42946cfc	90	ret = comedi_timeout(dev, s, insn, pcmad_ai_eoc, 0);
bcc01b4d HS	91	if (ret)
	92	return ret;
	93
3275b4d3 HS	94	val = inb(dev->iobase + PCMAD_LSB) \|
3275b4d3 HS	95	(inb(dev->iobase + PCMAD_MSB) << 8);
58e732ee	96
3170b256 HS	97	/* data is shifted on the pcmad12, fix it */
	98	if (s->maxdata == 0x0fff)
	99	val >>= 4;
	100
43db70a5	101	if (comedi_range_is_bipolar(s, range)) {
7ecc5370	102	/* munge the two's complement value */
3275b4d3	103	val ^= ((s->maxdata + 1) >> 1);
7ecc5370	104	}
3275b4d3 HS	105
3275b4d3 HS	106	data[i] = val;
58e732ee DS	107	}
58e732ee DS	108
3275b4d3	109	return insn->n;
58e732ee DS	110	}
58e732ee DS	111
da91b269	112	static int pcmad_attach(struct comedi_device dev, struct comedi_devconfig it)
58e732ee	113	{
3230e42a	114	const struct pcmad_board_struct *board = dev->board_ptr;
34c43922	115	struct comedi_subdevice *s;
3e9b1fca	116	int ret;
58e732ee	117
624b6530	118	ret = comedi_request_region(dev, it->options[0], 0x04);
3e9b1fca HS	119	if (ret)
3e9b1fca HS	120	return ret;
58e732ee	121
2f0b9d08	122	ret = comedi_alloc_subdevices(dev, 1);
8b6c5694	123	if (ret)
58e732ee	124	return ret;
c3744138	125
86bb856a	126	s = &dev->subdevices[0];
624b6530	127	s->type = COMEDI_SUBD_AI;
6092e942 HS	128	if (it->options[1]) {
	129	/* 8 differential channels */
	130	s->subdev_flags = SDF_READABLE \| AREF_DIFF;
	131	s->n_chan = 8;
	132	} else {
	133	/* 16 single-ended channels */
	134	s->subdev_flags = SDF_READABLE \| AREF_GROUND;
	135	s->n_chan = 16;
	136	}
624b6530	137	s->len_chanlist = 1;
d69b55f3	138	s->maxdata = board->ai_maxdata;
7ecc5370	139	s->range_table = it->options[2] ? &range_bipolar10 : &range_unipolar5;
624b6530	140	s->insn_read = pcmad_ai_insn_read;
58e732ee DS	141
	142	return 0;
	143	}
	144
294f930d	145	static struct comedi_driver pcmad_driver = {
3496cb9f HS	146	.driver_name = "pcmad",
	147	.module = THIS_MODULE,
	148	.attach = pcmad_attach,
3d1fe3f7	149	.detach = comedi_legacy_detach,
3496cb9f HS	150	.board_name = &pcmad_boards[0].name,
	151	.num_names = ARRAY_SIZE(pcmad_boards),
	152	.offset = sizeof(pcmad_boards[0]),
	153	};
294f930d	154	module_comedi_driver(pcmad_driver);
3496cb9f	155
90f703d3 AT	156	MODULE_AUTHOR("Comedi http://www.comedi.org");
	157	MODULE_DESCRIPTION("Comedi low-level driver");
	158	MODULE_LICENSE("GPL");