3 * Driver for Access I/O Products PC-104 AIO12-8 Analog I/O Board
4 * Copyright (C) 2006 C&C Technologies, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
19 * Description: Access I/O Products PC-104 AIO12-8 Analog I/O Board
20 * Author: Pablo Mejia <pablo.mejia@cctechnol.com>
21 * Devices: [Access I/O] PC-104 AIO12-8 (aio_aio12_8),
22 * [Access I/O] PC-104 AI12-8 (aio_ai12_8),
23 * [Access I/O] PC-104 AO12-8 (aio_ao12_8)
24 * Status: experimental
26 * Configuration Options:
27 * [0] - I/O port base address
30 * Only synchronous operations are supported.
33 #include <linux/module.h>
34 #include "../comedidev.h"
36 #include "comedi_8254.h"
42 #define AIO12_8_STATUS_REG 0x00
43 #define AIO12_8_STATUS_ADC_EOC BIT(7)
44 #define AIO12_8_STATUS_PORT_C_COS BIT(6)
45 #define AIO12_8_STATUS_IRQ_ENA BIT(2)
46 #define AIO12_8_INTERRUPT_REG 0x01
47 #define AIO12_8_INTERRUPT_ADC BIT(7)
48 #define AIO12_8_INTERRUPT_COS BIT(6)
49 #define AIO12_8_INTERRUPT_COUNTER1 BIT(5)
50 #define AIO12_8_INTERRUPT_PORT_C3 BIT(4)
51 #define AIO12_8_INTERRUPT_PORT_C0 BIT(3)
52 #define AIO12_8_INTERRUPT_ENA BIT(2)
53 #define AIO12_8_ADC_REG 0x02
54 #define AIO12_8_ADC_MODE(x) (((x) & 0x3) << 6)
55 #define AIO12_8_ADC_MODE_NORMAL AIO12_8_ADC_MODE(0)
56 #define AIO12_8_ADC_MODE_INT_CLK AIO12_8_ADC_MODE(1)
57 #define AIO12_8_ADC_MODE_STANDBY AIO12_8_ADC_MODE(2)
58 #define AIO12_8_ADC_MODE_POWERDOWN AIO12_8_ADC_MODE(3)
59 #define AIO12_8_ADC_ACQ(x) (((x) & 0x1) << 5)
60 #define AIO12_8_ADC_ACQ_3USEC AIO12_8_ADC_ACQ(0)
61 #define AIO12_8_ADC_ACQ_PROGRAM AIO12_8_ADC_ACQ(1)
62 #define AIO12_8_ADC_RANGE(x) ((x) << 3)
63 #define AIO12_8_ADC_CHAN(x) ((x) << 0)
64 #define AIO12_8_DAC_REG(x) (0x04 + (x) * 2)
65 #define AIO12_8_8254_BASE_REG 0x0c
66 #define AIO12_8_8255_BASE_REG 0x10
67 #define AIO12_8_DIO_CONTROL_REG 0x14
68 #define AIO12_8_DIO_CONTROL_TST BIT(0)
69 #define AIO12_8_ADC_TRIGGER_REG 0x15
70 #define AIO12_8_ADC_TRIGGER_RANGE(x) ((x) << 3)
71 #define AIO12_8_ADC_TRIGGER_CHAN(x) ((x) << 0)
72 #define AIO12_8_TRIGGER_REG 0x16
73 #define AIO12_8_TRIGGER_ADTRIG BIT(1)
74 #define AIO12_8_TRIGGER_DACTRIG BIT(0)
75 #define AIO12_8_COS_REG 0x17
76 #define AIO12_8_DAC_ENABLE_REG 0x18
77 #define AIO12_8_DAC_ENABLE_REF_ENA BIT(0)
79 static const struct comedi_lrange aio_aio12_8_range = {
88 struct aio12_8_boardtype {
90 unsigned int has_ai:1;
91 unsigned int has_ao:1;
94 static const struct aio12_8_boardtype board_types[] = {
96 .name = "aio_aio12_8",
100 .name = "aio_ai12_8",
103 .name = "aio_ao12_8",
108 static int aio_aio12_8_ai_eoc(struct comedi_device *dev,
109 struct comedi_subdevice *s,
110 struct comedi_insn *insn,
111 unsigned long context)
115 status = inb(dev->iobase + AIO12_8_STATUS_REG);
116 if (status & AIO12_8_STATUS_ADC_EOC)
121 static int aio_aio12_8_ai_read(struct comedi_device *dev,
122 struct comedi_subdevice *s,
123 struct comedi_insn *insn,
126 unsigned int chan = CR_CHAN(insn->chanspec);
127 unsigned int range = CR_RANGE(insn->chanspec);
129 unsigned char control;
134 * Setup the control byte for internal 2MHz clock, 3uS conversion,
135 * at the desired range of the requested channel.
137 control = AIO12_8_ADC_MODE_NORMAL | AIO12_8_ADC_ACQ_3USEC |
138 AIO12_8_ADC_RANGE(range) | AIO12_8_ADC_CHAN(chan);
140 /* Read status to clear EOC latch */
141 inb(dev->iobase + AIO12_8_STATUS_REG);
143 for (i = 0; i < insn->n; i++) {
144 /* Setup and start conversion */
145 outb(control, dev->iobase + AIO12_8_ADC_REG);
147 /* Wait for conversion to complete */
148 ret = comedi_timeout(dev, s, insn, aio_aio12_8_ai_eoc, 0);
152 val = inw(dev->iobase + AIO12_8_ADC_REG) & s->maxdata;
154 /* munge bipolar 2's complement data to offset binary */
155 if (comedi_range_is_bipolar(s, range))
156 val = comedi_offset_munge(s, val);
164 static int aio_aio12_8_ao_insn_write(struct comedi_device *dev,
165 struct comedi_subdevice *s,
166 struct comedi_insn *insn,
169 unsigned int chan = CR_CHAN(insn->chanspec);
170 unsigned int val = s->readback[chan];
174 outb(AIO12_8_DAC_ENABLE_REF_ENA, dev->iobase + AIO12_8_DAC_ENABLE_REG);
176 for (i = 0; i < insn->n; i++) {
178 outw(val, dev->iobase + AIO12_8_DAC_REG(chan));
180 s->readback[chan] = val;
185 static int aio_aio12_8_counter_insn_config(struct comedi_device *dev,
186 struct comedi_subdevice *s,
187 struct comedi_insn *insn,
190 unsigned int chan = CR_CHAN(insn->chanspec);
193 case INSN_CONFIG_GET_CLOCK_SRC:
195 * Channels 0 and 2 have external clock sources.
196 * Channel 1 has a fixed 1 MHz clock source.
199 data[1] = (chan == 1) ? I8254_OSC_BASE_1MHZ : 0;
208 static int aio_aio12_8_attach(struct comedi_device *dev,
209 struct comedi_devconfig *it)
211 const struct aio12_8_boardtype *board = dev->board_ptr;
212 struct comedi_subdevice *s;
215 ret = comedi_request_region(dev, it->options[0], 32);
219 dev->pacer = comedi_8254_init(dev->iobase + AIO12_8_8254_BASE_REG,
224 ret = comedi_alloc_subdevices(dev, 4);
228 /* Analog Input subdevice */
229 s = &dev->subdevices[0];
231 s->type = COMEDI_SUBD_AI;
232 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
235 s->range_table = &aio_aio12_8_range;
236 s->insn_read = aio_aio12_8_ai_read;
238 s->type = COMEDI_SUBD_UNUSED;
241 /* Analog Output subdevice */
242 s = &dev->subdevices[1];
244 s->type = COMEDI_SUBD_AO;
245 s->subdev_flags = SDF_WRITABLE | SDF_GROUND;
248 s->range_table = &aio_aio12_8_range;
249 s->insn_write = aio_aio12_8_ao_insn_write;
251 ret = comedi_alloc_subdev_readback(s);
255 s->type = COMEDI_SUBD_UNUSED;
258 s = &dev->subdevices[2];
259 /* 8255 Digital i/o subdevice */
260 ret = subdev_8255_init(dev, s, NULL, AIO12_8_8255_BASE_REG);
264 /* Counter subdevice (8254) */
265 s = &dev->subdevices[3];
266 comedi_8254_subdevice_init(s, dev->pacer);
268 dev->pacer->insn_config = aio_aio12_8_counter_insn_config;
273 static struct comedi_driver aio_aio12_8_driver = {
274 .driver_name = "aio_aio12_8",
275 .module = THIS_MODULE,
276 .attach = aio_aio12_8_attach,
277 .detach = comedi_legacy_detach,
278 .board_name = &board_types[0].name,
279 .num_names = ARRAY_SIZE(board_types),
280 .offset = sizeof(struct aio12_8_boardtype),
282 module_comedi_driver(aio_aio12_8_driver);
284 MODULE_AUTHOR("Comedi http://www.comedi.org");
285 MODULE_DESCRIPTION("Comedi driver for Access I/O AIO12-8 Analog I/O Board");
286 MODULE_LICENSE("GPL");