1/*
2
3    comedi/drivers/aio_aio12_8.c
4
5    Driver for Access I/O Products PC-104 AIO12-8 Analog I/O Board
6    Copyright (C) 2006 C&C Technologies, Inc.
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
19/*
20
21Driver: aio_aio12_8
22Description: Access I/O Products PC-104 AIO12-8 Analog I/O Board
23Author: Pablo Mejia <pablo.mejia@cctechnol.com>
24Devices: [Access I/O] PC-104 AIO12-8 (aio_aio12_8)
25	 [Access I/O] PC-104 AI12-8 (aio_ai12_8)
26	 [Access I/O] PC-104 AO12-8 (aio_ao12_8)
27Status: experimental
28
29Configuration Options:
30  [0] - I/O port base address
31
32Notes:
33
34  Only synchronous operations are supported.
35
36*/
37
38#include <linux/module.h>
39#include "../comedidev.h"
40#include "8255.h"
41
42/*
43 * Register map
44 */
45#define AIO12_8_STATUS_REG		0x00
46#define AIO12_8_STATUS_ADC_EOC		(1 << 7)
47#define AIO12_8_STATUS_PORT_C_COS	(1 << 6)
48#define AIO12_8_STATUS_IRQ_ENA		(1 << 2)
49#define AIO12_8_INTERRUPT_REG		0x01
50#define AIO12_8_INTERRUPT_ADC		(1 << 7)
51#define AIO12_8_INTERRUPT_COS		(1 << 6)
52#define AIO12_8_INTERRUPT_COUNTER1	(1 << 5)
53#define AIO12_8_INTERRUPT_PORT_C3	(1 << 4)
54#define AIO12_8_INTERRUPT_PORT_C0	(1 << 3)
55#define AIO12_8_INTERRUPT_ENA		(1 << 2)
56#define AIO12_8_ADC_REG			0x02
57#define AIO12_8_ADC_MODE_NORMAL		(0 << 6)
58#define AIO12_8_ADC_MODE_INT_CLK	(1 << 6)
59#define AIO12_8_ADC_MODE_STANDBY	(2 << 6)
60#define AIO12_8_ADC_MODE_POWERDOWN	(3 << 6)
61#define AIO12_8_ADC_ACQ_3USEC		(0 << 5)
62#define AIO12_8_ADC_ACQ_PROGRAM		(1 << 5)
63#define AIO12_8_ADC_RANGE(x)		((x) << 3)
64#define AIO12_8_ADC_CHAN(x)		((x) << 0)
65#define AIO12_8_DAC_REG(x)		(0x04 + (x) * 2)
66#define AIO12_8_8254_BASE_REG		0x0c
67#define AIO12_8_8255_BASE_REG		0x10
68#define AIO12_8_DIO_CONTROL_REG		0x14
69#define AIO12_8_DIO_CONTROL_TST		(1 << 0)
70#define AIO12_8_ADC_TRIGGER_REG		0x15
71#define AIO12_8_ADC_TRIGGER_RANGE(x)	((x) << 3)
72#define AIO12_8_ADC_TRIGGER_CHAN(x)	((x) << 0)
73#define AIO12_8_TRIGGER_REG		0x16
74#define AIO12_8_TRIGGER_ADTRIG		(1 << 1)
75#define AIO12_8_TRIGGER_DACTRIG		(1 << 0)
76#define AIO12_8_COS_REG			0x17
77#define AIO12_8_DAC_ENABLE_REG		0x18
78#define AIO12_8_DAC_ENABLE_REF_ENA	(1 << 0)
79
80struct aio12_8_boardtype {
81	const char *name;
82	int ai_nchan;
83	int ao_nchan;
84};
85
86static const struct aio12_8_boardtype board_types[] = {
87	{
88		.name		= "aio_aio12_8",
89		.ai_nchan	= 8,
90		.ao_nchan	= 4,
91	}, {
92		.name		= "aio_ai12_8",
93		.ai_nchan	= 8,
94	}, {
95		.name		= "aio_ao12_8",
96		.ao_nchan	= 4,
97	},
98};
99
100static int aio_aio12_8_ai_eoc(struct comedi_device *dev,
101			      struct comedi_subdevice *s,
102			      struct comedi_insn *insn,
103			      unsigned long context)
104{
105	unsigned int status;
106
107	status = inb(dev->iobase + AIO12_8_STATUS_REG);
108	if (status & AIO12_8_STATUS_ADC_EOC)
109		return 0;
110	return -EBUSY;
111}
112
113static int aio_aio12_8_ai_read(struct comedi_device *dev,
114			       struct comedi_subdevice *s,
115			       struct comedi_insn *insn, unsigned int *data)
116{
117	unsigned int chan = CR_CHAN(insn->chanspec);
118	unsigned int range = CR_RANGE(insn->chanspec);
119	unsigned char control;
120	int ret;
121	int n;
122
123	/*
124	 * Setup the control byte for internal 2MHz clock, 3uS conversion,
125	 * at the desired range of the requested channel.
126	 */
127	control = AIO12_8_ADC_MODE_NORMAL | AIO12_8_ADC_ACQ_3USEC |
128		  AIO12_8_ADC_RANGE(range) | AIO12_8_ADC_CHAN(chan);
129
130	/* Read status to clear EOC latch */
131	inb(dev->iobase + AIO12_8_STATUS_REG);
132
133	for (n = 0; n < insn->n; n++) {
134		/*  Setup and start conversion */
135		outb(control, dev->iobase + AIO12_8_ADC_REG);
136
137		/*  Wait for conversion to complete */
138		ret = comedi_timeout(dev, s, insn, aio_aio12_8_ai_eoc, 0);
139		if (ret)
140			return ret;
141
142		data[n] = inw(dev->iobase + AIO12_8_ADC_REG) & s->maxdata;
143	}
144
145	return insn->n;
146}
147
148static int aio_aio12_8_ao_insn_write(struct comedi_device *dev,
149				     struct comedi_subdevice *s,
150				     struct comedi_insn *insn,
151				     unsigned int *data)
152{
153	unsigned int chan = CR_CHAN(insn->chanspec);
154	unsigned int val = s->readback[chan];
155	int i;
156
157	/* enable DACs */
158	outb(AIO12_8_DAC_ENABLE_REF_ENA, dev->iobase + AIO12_8_DAC_ENABLE_REG);
159
160	for (i = 0; i < insn->n; i++) {
161		val = data[i];
162		outw(val, dev->iobase + AIO12_8_DAC_REG(chan));
163	}
164	s->readback[chan] = val;
165
166	return insn->n;
167}
168
169static const struct comedi_lrange range_aio_aio12_8 = {
170	4, {
171		UNI_RANGE(5),
172		BIP_RANGE(5),
173		UNI_RANGE(10),
174		BIP_RANGE(10)
175	}
176};
177
178static int aio_aio12_8_attach(struct comedi_device *dev,
179			      struct comedi_devconfig *it)
180{
181	const struct aio12_8_boardtype *board = dev->board_ptr;
182	struct comedi_subdevice *s;
183	int ret;
184
185	ret = comedi_request_region(dev, it->options[0], 32);
186	if (ret)
187		return ret;
188
189	ret = comedi_alloc_subdevices(dev, 4);
190	if (ret)
191		return ret;
192
193	s = &dev->subdevices[0];
194	if (board->ai_nchan) {
195		/* Analog input subdevice */
196		s->type		= COMEDI_SUBD_AI;
197		s->subdev_flags	= SDF_READABLE | SDF_GROUND | SDF_DIFF;
198		s->n_chan	= board->ai_nchan;
199		s->maxdata	= 0x0fff;
200		s->range_table	= &range_aio_aio12_8;
201		s->insn_read	= aio_aio12_8_ai_read;
202	} else {
203		s->type = COMEDI_SUBD_UNUSED;
204	}
205
206	s = &dev->subdevices[1];
207	if (board->ao_nchan) {
208		/* Analog output subdevice */
209		s->type		= COMEDI_SUBD_AO;
210		s->subdev_flags	= SDF_WRITABLE | SDF_GROUND | SDF_DIFF;
211		s->n_chan	= 4;
212		s->maxdata	= 0x0fff;
213		s->range_table	= &range_aio_aio12_8;
214		s->insn_write	= aio_aio12_8_ao_insn_write;
215		s->insn_read	= comedi_readback_insn_read;
216
217		ret = comedi_alloc_subdev_readback(s);
218		if (ret)
219			return ret;
220	} else {
221		s->type = COMEDI_SUBD_UNUSED;
222	}
223
224	s = &dev->subdevices[2];
225	/* 8255 Digital i/o subdevice */
226	ret = subdev_8255_init(dev, s, NULL, AIO12_8_8255_BASE_REG);
227	if (ret)
228		return ret;
229
230	s = &dev->subdevices[3];
231	/* 8254 counter/timer subdevice */
232	s->type		= COMEDI_SUBD_UNUSED;
233
234	return 0;
235}
236
237static struct comedi_driver aio_aio12_8_driver = {
238	.driver_name	= "aio_aio12_8",
239	.module		= THIS_MODULE,
240	.attach		= aio_aio12_8_attach,
241	.detach		= comedi_legacy_detach,
242	.board_name	= &board_types[0].name,
243	.num_names	= ARRAY_SIZE(board_types),
244	.offset		= sizeof(struct aio12_8_boardtype),
245};
246module_comedi_driver(aio_aio12_8_driver);
247
248MODULE_AUTHOR("Comedi http://www.comedi.org");
249MODULE_DESCRIPTION("Comedi low-level driver");
250MODULE_LICENSE("GPL");
251