1/* 2 comedi/drivers/dt2815.c 3 Hardware driver for Data Translation DT2815 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/* 19Driver: dt2815 20Description: Data Translation DT2815 21Author: ds 22Status: mostly complete, untested 23Devices: [Data Translation] DT2815 (dt2815) 24 25I'm not sure anyone has ever tested this board. If you have information 26contrary, please update. 27 28Configuration options: 29 [0] - I/O port base base address 30 [1] - IRQ (unused) 31 [2] - Voltage unipolar/bipolar configuration 32 0 == unipolar 5V (0V -- +5V) 33 1 == bipolar 5V (-5V -- +5V) 34 [3] - Current offset configuration 35 0 == disabled (0mA -- +32mAV) 36 1 == enabled (+4mA -- +20mAV) 37 [4] - Firmware program configuration 38 0 == program 1 (see manual table 5-4) 39 1 == program 2 (see manual table 5-4) 40 2 == program 3 (see manual table 5-4) 41 3 == program 4 (see manual table 5-4) 42 [5] - Analog output 0 range configuration 43 0 == voltage 44 1 == current 45 [6] - Analog output 1 range configuration (same options) 46 [7] - Analog output 2 range configuration (same options) 47 [8] - Analog output 3 range configuration (same options) 48 [9] - Analog output 4 range configuration (same options) 49 [10] - Analog output 5 range configuration (same options) 50 [11] - Analog output 6 range configuration (same options) 51 [12] - Analog output 7 range configuration (same options) 52*/ 53 54#include <linux/module.h> 55#include "../comedidev.h" 56 57#include <linux/delay.h> 58 59#define DT2815_DATA 0 60#define DT2815_STATUS 1 61 62struct dt2815_private { 63 64 const struct comedi_lrange *range_type_list[8]; 65 unsigned int ao_readback[8]; 66}; 67 68static int dt2815_ao_status(struct comedi_device *dev, 69 struct comedi_subdevice *s, 70 struct comedi_insn *insn, 71 unsigned long context) 72{ 73 unsigned int status; 74 75 status = inb(dev->iobase + DT2815_STATUS); 76 if (status == context) 77 return 0; 78 return -EBUSY; 79} 80 81static int dt2815_ao_insn_read(struct comedi_device *dev, 82 struct comedi_subdevice *s, 83 struct comedi_insn *insn, unsigned int *data) 84{ 85 struct dt2815_private *devpriv = dev->private; 86 int i; 87 int chan = CR_CHAN(insn->chanspec); 88 89 for (i = 0; i < insn->n; i++) 90 data[i] = devpriv->ao_readback[chan]; 91 92 return i; 93} 94 95static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s, 96 struct comedi_insn *insn, unsigned int *data) 97{ 98 struct dt2815_private *devpriv = dev->private; 99 int i; 100 int chan = CR_CHAN(insn->chanspec); 101 unsigned int lo, hi; 102 int ret; 103 104 for (i = 0; i < insn->n; i++) { 105 lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01; 106 hi = (data[i] & 0xff0) >> 4; 107 108 ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x00); 109 if (ret) 110 return ret; 111 112 outb(lo, dev->iobase + DT2815_DATA); 113 114 ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x10); 115 if (ret) 116 return ret; 117 118 devpriv->ao_readback[chan] = data[i]; 119 } 120 return i; 121} 122 123/* 124 options[0] Board base address 125 options[1] IRQ (not applicable) 126 options[2] Voltage unipolar/bipolar configuration 127 0 == unipolar 5V (0V -- +5V) 128 1 == bipolar 5V (-5V -- +5V) 129 options[3] Current offset configuration 130 0 == disabled (0mA -- +32mAV) 131 1 == enabled (+4mA -- +20mAV) 132 options[4] Firmware program configuration 133 0 == program 1 (see manual table 5-4) 134 1 == program 2 (see manual table 5-4) 135 2 == program 3 (see manual table 5-4) 136 3 == program 4 (see manual table 5-4) 137 options[5] Analog output 0 range configuration 138 0 == voltage 139 1 == current 140 options[6] Analog output 1 range configuration 141 ... 142 options[12] Analog output 7 range configuration 143 0 == voltage 144 1 == current 145 */ 146 147static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it) 148{ 149 struct dt2815_private *devpriv; 150 struct comedi_subdevice *s; 151 int i; 152 const struct comedi_lrange *current_range_type, *voltage_range_type; 153 int ret; 154 155 ret = comedi_request_region(dev, it->options[0], 0x2); 156 if (ret) 157 return ret; 158 159 ret = comedi_alloc_subdevices(dev, 1); 160 if (ret) 161 return ret; 162 163 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); 164 if (!devpriv) 165 return -ENOMEM; 166 167 s = &dev->subdevices[0]; 168 /* ao subdevice */ 169 s->type = COMEDI_SUBD_AO; 170 s->subdev_flags = SDF_WRITABLE; 171 s->maxdata = 0xfff; 172 s->n_chan = 8; 173 s->insn_write = dt2815_ao_insn; 174 s->insn_read = dt2815_ao_insn_read; 175 s->range_table_list = devpriv->range_type_list; 176 177 current_range_type = (it->options[3]) 178 ? &range_4_20mA : &range_0_32mA; 179 voltage_range_type = (it->options[2]) 180 ? &range_bipolar5 : &range_unipolar5; 181 for (i = 0; i < 8; i++) { 182 devpriv->range_type_list[i] = (it->options[5 + i]) 183 ? current_range_type : voltage_range_type; 184 } 185 186 /* Init the 2815 */ 187 outb(0x00, dev->iobase + DT2815_STATUS); 188 for (i = 0; i < 100; i++) { 189 /* This is incredibly slow (approx 20 ms) */ 190 unsigned int status; 191 192 udelay(1000); 193 status = inb(dev->iobase + DT2815_STATUS); 194 if (status == 4) { 195 unsigned int program; 196 197 program = (it->options[4] & 0x3) << 3 | 0x7; 198 outb(program, dev->iobase + DT2815_DATA); 199 dev_dbg(dev->class_dev, "program: 0x%x (@t=%d)\n", 200 program, i); 201 break; 202 } else if (status != 0x00) { 203 dev_dbg(dev->class_dev, 204 "unexpected status 0x%x (@t=%d)\n", 205 status, i); 206 if (status & 0x60) 207 outb(0x00, dev->iobase + DT2815_STATUS); 208 } 209 } 210 211 return 0; 212} 213 214static struct comedi_driver dt2815_driver = { 215 .driver_name = "dt2815", 216 .module = THIS_MODULE, 217 .attach = dt2815_attach, 218 .detach = comedi_legacy_detach, 219}; 220module_comedi_driver(dt2815_driver); 221 222MODULE_AUTHOR("Comedi http://www.comedi.org"); 223MODULE_DESCRIPTION("Comedi low-level driver"); 224MODULE_LICENSE("GPL"); 225