3 comedi/drivers/aio_aio12_8.c
5 Driver for Access I/O Products PC-104 AIO12-8 Analog I/O Board
6 Copyright (C) 2006 C&C Technologies, Inc.
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.
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.
22 Description: Access I/O Products PC-104 AIO12-8 Analog I/O Board
23 Author: Pablo Mejia <pablo.mejia@cctechnol.com>
24 Devices: [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)
29 Configuration Options:
30 [0] - I/O port base address
34 Only synchronous operations are supported.
38 #include <linux/module.h>
39 #include "../comedidev.h"
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)
80 struct aio12_8_boardtype {
86 static const struct aio12_8_boardtype board_types[] = {
88 .name = "aio_aio12_8",
100 struct aio12_8_private {
101 unsigned int ao_readback[4];
104 static int aio_aio12_8_ai_read(struct comedi_device *dev,
105 struct comedi_subdevice *s,
106 struct comedi_insn *insn, unsigned int *data)
108 unsigned int chan = CR_CHAN(insn->chanspec);
109 unsigned int range = CR_RANGE(insn->chanspec);
111 unsigned char control;
115 * Setup the control byte for internal 2MHz clock, 3uS conversion,
116 * at the desired range of the requested channel.
118 control = AIO12_8_ADC_MODE_NORMAL | AIO12_8_ADC_ACQ_3USEC |
119 AIO12_8_ADC_RANGE(range) | AIO12_8_ADC_CHAN(chan);
121 /* Read status to clear EOC latch */
122 inb(dev->iobase + AIO12_8_STATUS_REG);
124 for (n = 0; n < insn->n; n++) {
127 /* Setup and start conversion */
128 outb(control, dev->iobase + AIO12_8_ADC_REG);
130 /* Wait for conversion to complete */
132 val = inb(dev->iobase + AIO12_8_STATUS_REG);
135 dev_err(dev->class_dev, "ADC timeout\n");
138 } while (!(val & AIO12_8_STATUS_ADC_EOC));
140 data[n] = inw(dev->iobase + AIO12_8_ADC_REG) & s->maxdata;
146 static int aio_aio12_8_ao_read(struct comedi_device *dev,
147 struct comedi_subdevice *s,
148 struct comedi_insn *insn, unsigned int *data)
150 struct aio12_8_private *devpriv = dev->private;
151 unsigned int chan = CR_CHAN(insn->chanspec);
152 int val = devpriv->ao_readback[chan];
155 for (i = 0; i < insn->n; i++)
160 static int aio_aio12_8_ao_write(struct comedi_device *dev,
161 struct comedi_subdevice *s,
162 struct comedi_insn *insn, unsigned int *data)
164 struct aio12_8_private *devpriv = dev->private;
165 unsigned int chan = CR_CHAN(insn->chanspec);
166 unsigned long port = dev->iobase + AIO12_8_DAC_REG(chan);
167 unsigned int val = 0;
171 outb(AIO12_8_DAC_ENABLE_REF_ENA, dev->iobase + AIO12_8_DAC_ENABLE_REG);
173 for (i = 0; i < insn->n; i++) {
178 devpriv->ao_readback[chan] = val;
183 static const struct comedi_lrange range_aio_aio12_8 = {
193 static int aio_aio12_8_attach(struct comedi_device *dev,
194 struct comedi_devconfig *it)
196 const struct aio12_8_boardtype *board = comedi_board(dev);
197 struct aio12_8_private *devpriv;
198 struct comedi_subdevice *s;
201 ret = comedi_request_region(dev, it->options[0], 32);
205 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
209 ret = comedi_alloc_subdevices(dev, 4);
213 s = &dev->subdevices[0];
214 if (board->ai_nchan) {
215 /* Analog input subdevice */
216 s->type = COMEDI_SUBD_AI;
217 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
218 s->n_chan = board->ai_nchan;
220 s->range_table = &range_aio_aio12_8;
221 s->insn_read = aio_aio12_8_ai_read;
223 s->type = COMEDI_SUBD_UNUSED;
226 s = &dev->subdevices[1];
227 if (board->ao_nchan) {
228 /* Analog output subdevice */
229 s->type = COMEDI_SUBD_AO;
230 s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF;
233 s->range_table = &range_aio_aio12_8;
234 s->insn_read = aio_aio12_8_ao_read;
235 s->insn_write = aio_aio12_8_ao_write;
237 s->type = COMEDI_SUBD_UNUSED;
240 s = &dev->subdevices[2];
241 /* 8255 Digital i/o subdevice */
242 ret = subdev_8255_init(dev, s, NULL,
243 dev->iobase + AIO12_8_8255_BASE_REG);
247 s = &dev->subdevices[3];
248 /* 8254 counter/timer subdevice */
249 s->type = COMEDI_SUBD_UNUSED;
251 dev_info(dev->class_dev, "%s: %s attached\n",
252 dev->driver->driver_name, dev->board_name);
257 static struct comedi_driver aio_aio12_8_driver = {
258 .driver_name = "aio_aio12_8",
259 .module = THIS_MODULE,
260 .attach = aio_aio12_8_attach,
261 .detach = comedi_legacy_detach,
262 .board_name = &board_types[0].name,
263 .num_names = ARRAY_SIZE(board_types),
264 .offset = sizeof(struct aio12_8_boardtype),
266 module_comedi_driver(aio_aio12_8_driver);
268 MODULE_AUTHOR("Comedi http://www.comedi.org");
269 MODULE_DESCRIPTION("Comedi low-level driver");
270 MODULE_LICENSE("GPL");