Staging: comedi: add rti802 driver
Driver for Analog Devices RTI-802 board From: Anders Blomdell <anders.blomdell@control.lth.se> 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>
This commit is contained in:
Anders Blomdell
Greg Kroah-Hartman
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/*
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comedi/drivers/rti802.c
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Hardware driver for Analog Devices RTI-802 board
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COMEDI - Linux Control and Measurement Device Interface
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Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
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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: rti802
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Description: Analog Devices RTI-802
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Author: Anders Blomdell <anders.blomdell@control.lth.se>
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Devices: [Analog Devices] RTI-802 (rti802)
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Status: works
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Configuration Options:
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[0] - i/o base
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[1] - unused
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[2] - dac#0 0=two's comp, 1=straight
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[3] - dac#0 0=bipolar, 1=unipolar
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[4] - dac#1 ...
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...
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[17] - dac#7 ...
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*/
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#include "../comedidev.h"
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#include <linux/ioport.h>
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#define RTI802_SIZE 4
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#define RTI802_SELECT 0
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#define RTI802_DATALOW 1
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#define RTI802_DATAHIGH 2
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static int rti802_attach(comedi_device * dev, comedi_devconfig * it);
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static int rti802_detach(comedi_device * dev);
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static comedi_driver driver_rti802 = {
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driver_name:"rti802",
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module:THIS_MODULE,
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attach:rti802_attach,
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detach:rti802_detach,
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};
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COMEDI_INITCLEANUP(driver_rti802);
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typedef struct {
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enum {
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dac_2comp, dac_straight
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} dac_coding[8];
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const comedi_lrange *range_type_list[8];
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lsampl_t ao_readback[8];
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} rti802_private;
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#define devpriv ((rti802_private *)dev->private)
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static int rti802_ao_insn_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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for (i = 0; i < insn->n; i++)
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data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
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return i;
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}
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static int rti802_ao_insn_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, d;
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int chan = CR_CHAN(insn->chanspec);
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for (i = 0; i < insn->n; i++) {
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d = devpriv->ao_readback[chan] = data[i];
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if (devpriv->dac_coding[chan] == dac_2comp)
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d ^= 0x800;
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outb(chan, dev->iobase + RTI802_SELECT);
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outb(d & 0xff, dev->iobase + RTI802_DATALOW);
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outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
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}
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return i;
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}
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static int rti802_attach(comedi_device * dev, comedi_devconfig * it)
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{
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comedi_subdevice *s;
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int i;
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unsigned long iobase;
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iobase = it->options[0];
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printk("comedi%d: rti802: 0x%04lx ", dev->minor, iobase);
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if (!request_region(iobase, RTI802_SIZE, "rti802")) {
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printk("I/O port conflict\n");
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return -EIO;
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}
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dev->iobase = iobase;
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dev->board_name = "rti802";
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if (alloc_subdevices(dev, 1) < 0
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|| alloc_private(dev, sizeof(rti802_private))) {
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return -ENOMEM;
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}
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s = dev->subdevices;
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/* ao subdevice */
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s->type = COMEDI_SUBD_AO;
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s->subdev_flags = SDF_WRITABLE;
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s->maxdata = 0xfff;
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s->n_chan = 8;
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s->insn_read = rti802_ao_insn_read;
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s->insn_write = rti802_ao_insn_write;
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s->range_table_list = devpriv->range_type_list;
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for (i = 0; i < 8; i++) {
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devpriv->dac_coding[i] = (it->options[3 + 2 * i])
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? (dac_straight)
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: (dac_2comp);
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devpriv->range_type_list[i] = (it->options[2 + 2 * i])
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? &range_unipolar10 : &range_bipolar10;
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}
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printk("\n");
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return 0;
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}
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static int rti802_detach(comedi_device * dev)
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{
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printk("comedi%d: rti802: remove\n", dev->minor);
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if (dev->iobase)
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release_region(dev->iobase, RTI802_SIZE);
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return 0;
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}
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