1/* 2 * rti802.c 3 * Comedi driver for Analog Devices RTI-802 board 4 * 5 * COMEDI - Linux Control and Measurement Device Interface 6 * Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se> 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 * Driver: rti802 21 * Description: Analog Devices RTI-802 22 * Author: Anders Blomdell <anders.blomdell@control.lth.se> 23 * Devices: [Analog Devices] RTI-802 (rti802) 24 * Status: works 25 * 26 * Configuration Options: 27 * [0] - i/o base 28 * [1] - unused 29 * [2,4,6,8,10,12,14,16] - dac#[0-7] 0=two's comp, 1=straight 30 * [3,5,7,9,11,13,15,17] - dac#[0-7] 0=bipolar, 1=unipolar 31 */ 32 33#include <linux/module.h> 34#include "../comedidev.h" 35 36/* 37 * Register I/O map 38 */ 39#define RTI802_SELECT 0x00 40#define RTI802_DATALOW 0x01 41#define RTI802_DATAHIGH 0x02 42 43struct rti802_private { 44 enum { 45 dac_2comp, dac_straight 46 } dac_coding[8]; 47 const struct comedi_lrange *range_type_list[8]; 48}; 49 50static int rti802_ao_insn_write(struct comedi_device *dev, 51 struct comedi_subdevice *s, 52 struct comedi_insn *insn, 53 unsigned int *data) 54{ 55 struct rti802_private *devpriv = dev->private; 56 unsigned int chan = CR_CHAN(insn->chanspec); 57 int i; 58 59 outb(chan, dev->iobase + RTI802_SELECT); 60 61 for (i = 0; i < insn->n; i++) { 62 unsigned int val = data[i]; 63 64 s->readback[chan] = val; 65 66 /* munge offset binary to two's complement if needed */ 67 if (devpriv->dac_coding[chan] == dac_2comp) 68 val = comedi_offset_munge(s, val); 69 70 outb(val & 0xff, dev->iobase + RTI802_DATALOW); 71 outb((val >> 8) & 0xff, dev->iobase + RTI802_DATAHIGH); 72 } 73 74 return insn->n; 75} 76 77static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it) 78{ 79 struct rti802_private *devpriv; 80 struct comedi_subdevice *s; 81 int i; 82 int ret; 83 84 ret = comedi_request_region(dev, it->options[0], 0x04); 85 if (ret) 86 return ret; 87 88 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); 89 if (!devpriv) 90 return -ENOMEM; 91 92 ret = comedi_alloc_subdevices(dev, 1); 93 if (ret) 94 return ret; 95 96 /* Analog Output subdevice */ 97 s = &dev->subdevices[0]; 98 s->type = COMEDI_SUBD_AO; 99 s->subdev_flags = SDF_WRITABLE; 100 s->maxdata = 0xfff; 101 s->n_chan = 8; 102 s->insn_write = rti802_ao_insn_write; 103 104 ret = comedi_alloc_subdev_readback(s); 105 if (ret) 106 return ret; 107 108 s->range_table_list = devpriv->range_type_list; 109 for (i = 0; i < 8; i++) { 110 devpriv->dac_coding[i] = (it->options[3 + 2 * i]) 111 ? (dac_straight) : (dac_2comp); 112 devpriv->range_type_list[i] = (it->options[2 + 2 * i]) 113 ? &range_unipolar10 : &range_bipolar10; 114 } 115 116 return 0; 117} 118 119static struct comedi_driver rti802_driver = { 120 .driver_name = "rti802", 121 .module = THIS_MODULE, 122 .attach = rti802_attach, 123 .detach = comedi_legacy_detach, 124}; 125module_comedi_driver(rti802_driver); 126 127MODULE_AUTHOR("Comedi http://www.comedi.org"); 128MODULE_DESCRIPTION("Comedi driver for Analog Devices RTI-802 board"); 129MODULE_LICENSE("GPL"); 130