Staging: comedi: add aio_aio12_8 driver
Diver for Acces I/O Products PC-104 AIO12-8 Analog I/O Board From: Pablo Mejia <pablo.mejia@cctechnol.com> Cc: David Schleef <ds@schleef.org> Cc: Frank Mori Hess <fmhess@users.sourceforge.net> Cc: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Pablo Mejia
Greg Kroah-Hartman
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ebd127c3f1
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7623199aa4
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/*
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comedi/drivers/aio_aio12_8.c
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Driver for Acces I/O Products PC-104 AIO12-8 Analog I/O Board
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Copyright (C) 2006 C&C Technologies, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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Driver: aio_aio12_8
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Description: Acces I/O Products PC-104 AIO12-8 Analog I/O Board
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Author: Pablo Mejia <pablo.mejia@cctechnol.com>
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Devices:
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[Acces I/O] PC-104 AIO12-8
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Status: experimental
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Configuration Options:
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[0] - I/O port base address
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Notes:
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Only synchronous operations are supported.
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*/
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#include "../comedidev.h"
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#include <linux/ioport.h>
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#include "8255.h"
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#define AIO12_8_STATUS 0x00
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#define AIO12_8_INTERRUPT 0x01
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#define AIO12_8_ADC 0x02
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#define AIO12_8_DAC_0 0x04
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#define AIO12_8_DAC_1 0x06
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#define AIO12_8_DAC_2 0x08
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#define AIO12_8_DAC_3 0x0A
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#define AIO12_8_COUNTER_0 0x0C
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#define AIO12_8_COUNTER_1 0x0D
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#define AIO12_8_COUNTER_2 0x0E
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#define AIO12_8_COUNTER_CONTROL 0x0F
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#define AIO12_8_DIO_0 0x10
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#define AIO12_8_DIO_1 0x11
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#define AIO12_8_DIO_2 0x12
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#define AIO12_8_DIO_STATUS 0x13
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#define AIO12_8_DIO_CONTROL 0x14
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#define AIO12_8_ADC_TRIGGER_CONTROL 0x15
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#define AIO12_8_TRIGGER 0x16
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#define AIO12_8_POWER 0x17
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#define STATUS_ADC_EOC 0x80
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#define ADC_MODE_NORMAL 0x00
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#define ADC_MODE_INTERNAL_CLOCK 0x40
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#define ADC_MODE_STANDBY 0x80
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#define ADC_MODE_POWERDOWN 0xC0
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#define DAC_ENABLE 0x18
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typedef struct {
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const char *name;
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} board_type;
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static const board_type board_types[] = {
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{
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name: "aio_aio12_8"},
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};
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#define thisboard ((const board_type *) dev->board_ptr)
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typedef struct {
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lsampl_t ao_readback[4];
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} aio12_8_private;
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#define devpriv ((aio12_8_private *) dev->private)
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static int aio_aio12_8_ai_read(comedi_device * dev, comedi_subdevice * s,
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comedi_insn * insn, lsampl_t * data)
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{
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int n;
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unsigned char control =
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ADC_MODE_NORMAL |
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(CR_RANGE(insn->chanspec) << 3) | CR_CHAN(insn->chanspec);
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//read status to clear EOC latch
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inb(dev->iobase + AIO12_8_STATUS);
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for (n = 0; n < insn->n; n++) {
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int timeout = 5;
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// Setup and start conversion
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outb(control, dev->iobase + AIO12_8_ADC);
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// Wait for conversion to complete
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while (timeout &&
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!(inb(dev->iobase + AIO12_8_STATUS) & STATUS_ADC_EOC)) {
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timeout--;
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printk("timeout %d\n", timeout);
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comedi_udelay(1);
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}
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if (timeout == 0) {
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comedi_error(dev, "ADC timeout");
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return -EIO;
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}
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data[n] = inw(dev->iobase + AIO12_8_ADC) & 0x0FFF;
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}
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return n;
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}
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static int aio_aio12_8_ao_read(comedi_device * dev, comedi_subdevice * s,
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comedi_insn * insn, lsampl_t * data)
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{
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int i;
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int val = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
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for (i = 0; i < insn->n; i++)
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data[i] = val;
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return insn->n;
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}
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static int aio_aio12_8_ao_write(comedi_device * dev, comedi_subdevice * s,
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comedi_insn * insn, lsampl_t * data)
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{
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int i;
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int chan = CR_CHAN(insn->chanspec);
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unsigned long port = dev->iobase + AIO12_8_DAC_0 + (2 * chan);
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//enable DACs
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outb(0x01, dev->iobase + DAC_ENABLE);
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for (i = 0; i < insn->n; i++) {
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outb(data[i] & 0xFF, port); // LSB
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outb((data[i] >> 8) & 0x0F, port + 1); // MSB
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devpriv->ao_readback[chan] = data[i];
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}
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return insn->n;
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}
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static const comedi_lrange range_aio_aio12_8 = {
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4,
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{
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UNI_RANGE(5),
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BIP_RANGE(5),
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UNI_RANGE(10),
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BIP_RANGE(10),
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}
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};
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static int aio_aio12_8_attach(comedi_device * dev, comedi_devconfig * it)
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{
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int iobase;
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comedi_subdevice *s;
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iobase = it->options[0];
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if (!request_region(iobase, 24, "aio_aio12_8")) {
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printk("I/O port conflict");
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return -EIO;
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}
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dev->board_name = thisboard->name;
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dev->iobase = iobase;
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if (alloc_private(dev, sizeof(aio12_8_private)) < 0)
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return -ENOMEM;
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if (alloc_subdevices(dev, 3) < 0)
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return -ENOMEM;
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s = &dev->subdevices[0];
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s->type = COMEDI_SUBD_AI;
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s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
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s->n_chan = 8;
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s->maxdata = (1 << 12) - 1;
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s->range_table = &range_aio_aio12_8;
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s->insn_read = aio_aio12_8_ai_read;
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s = &dev->subdevices[1];
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s->type = COMEDI_SUBD_AO;
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s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF;
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s->n_chan = 4;
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s->maxdata = (1 << 12) - 1;
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s->range_table = &range_aio_aio12_8;
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s->insn_read = aio_aio12_8_ao_read;
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s->insn_write = aio_aio12_8_ao_write;
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s = &dev->subdevices[2];
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subdev_8255_init(dev, s, NULL, dev->iobase + AIO12_8_DIO_0);
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return 0;
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}
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static int aio_aio12_8_detach(comedi_device * dev)
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{
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subdev_8255_cleanup(dev, &dev->subdevices[2]);
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if (dev->iobase)
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release_region(dev->iobase, 24);
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return 0;
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}
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static comedi_driver driver_aio_aio12_8 = {
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driver_name:"aio_aio12_8",
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module:THIS_MODULE,
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attach:aio_aio12_8_attach,
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detach:aio_aio12_8_detach,
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board_name:&board_types[0].name,
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num_names:1,
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offset:sizeof(board_type),
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};
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COMEDI_INITCLEANUP(driver_aio_aio12_8);
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