dt2815.c revision 90f703d30dd3e0c16ff80f35e34e511385a05ad5
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 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 22 */ 23/* 24Driver: dt2815 25Description: Data Translation DT2815 26Author: ds 27Status: mostly complete, untested 28Devices: [Data Translation] DT2815 (dt2815) 29 30I'm not sure anyone has ever tested this board. If you have information 31contrary, please update. 32 33Configuration options: 34 [0] - I/O port base base address 35 [1] - IRQ (unused) 36 [2] - Voltage unipolar/bipolar configuration 37 0 == unipolar 5V (0V -- +5V) 38 1 == bipolar 5V (-5V -- +5V) 39 [3] - Current offset configuration 40 0 == disabled (0mA -- +32mAV) 41 1 == enabled (+4mA -- +20mAV) 42 [4] - Firmware program configuration 43 0 == program 1 (see manual table 5-4) 44 1 == program 2 (see manual table 5-4) 45 2 == program 3 (see manual table 5-4) 46 3 == program 4 (see manual table 5-4) 47 [5] - Analog output 0 range configuration 48 0 == voltage 49 1 == current 50 [6] - Analog output 1 range configuration (same options) 51 [7] - Analog output 2 range configuration (same options) 52 [8] - Analog output 3 range configuration (same options) 53 [9] - Analog output 4 range configuration (same options) 54 [10] - Analog output 5 range configuration (same options) 55 [11] - Analog output 6 range configuration (same options) 56 [12] - Analog output 7 range configuration (same options) 57*/ 58 59#include "../comedidev.h" 60 61#include <linux/ioport.h> 62#include <linux/delay.h> 63 64static const struct comedi_lrange 65 range_dt2815_ao_32_current = {1, {RANGE_mA(0, 32)} }; 66 67static const struct comedi_lrange 68 range_dt2815_ao_20_current = {1, {RANGE_mA(4, 20)} }; 69 70#define DT2815_SIZE 2 71 72#define DT2815_DATA 0 73#define DT2815_STATUS 1 74 75static int dt2815_attach(struct comedi_device *dev, 76 struct comedi_devconfig *it); 77static int dt2815_detach(struct comedi_device *dev); 78static struct comedi_driver driver_dt2815 = { 79 .driver_name = "dt2815", 80 .module = THIS_MODULE, 81 .attach = dt2815_attach, 82 .detach = dt2815_detach, 83}; 84 85COMEDI_INITCLEANUP(driver_dt2815); 86 87static void dt2815_free_resources(struct comedi_device *dev); 88 89struct dt2815_private { 90 91 const struct comedi_lrange *range_type_list[8]; 92 unsigned int ao_readback[8]; 93}; 94 95#define devpriv ((struct dt2815_private *)dev->private) 96 97static int dt2815_wait_for_status(struct comedi_device *dev, int status) 98{ 99 int i; 100 101 for (i = 0; i < 100; i++) { 102 if (inb(dev->iobase + DT2815_STATUS) == status) 103 break; 104 } 105 return status; 106} 107 108static int dt2815_ao_insn_read(struct comedi_device *dev, 109 struct comedi_subdevice *s, 110 struct comedi_insn *insn, unsigned int *data) 111{ 112 int i; 113 int chan = CR_CHAN(insn->chanspec); 114 115 for (i = 0; i < insn->n; i++) 116 data[i] = devpriv->ao_readback[chan]; 117 118 return i; 119} 120 121static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s, 122 struct comedi_insn *insn, unsigned int *data) 123{ 124 int i; 125 int chan = CR_CHAN(insn->chanspec); 126 unsigned int status; 127 unsigned int lo, hi; 128 129 for (i = 0; i < insn->n; i++) { 130 lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01; 131 hi = (data[i] & 0xff0) >> 4; 132 133 status = dt2815_wait_for_status(dev, 0x00); 134 if (status != 0) { 135 printk(KERN_WARNING "dt2815: failed to write low byte " 136 "on %d reason %x\n", chan, status); 137 return -EBUSY; 138 } 139 140 outb(lo, dev->iobase + DT2815_DATA); 141 142 status = dt2815_wait_for_status(dev, 0x10); 143 if (status != 0x10) { 144 printk(KERN_WARNING "dt2815: failed to write high byte " 145 "on %d reason %x\n", chan, status); 146 return -EBUSY; 147 } 148 devpriv->ao_readback[chan] = data[i]; 149 } 150 return i; 151} 152 153/* 154 options[0] Board base address 155 options[1] IRQ (not applicable) 156 options[2] Voltage unipolar/bipolar configuration 157 0 == unipolar 5V (0V -- +5V) 158 1 == bipolar 5V (-5V -- +5V) 159 options[3] Current offset configuration 160 0 == disabled (0mA -- +32mAV) 161 1 == enabled (+4mA -- +20mAV) 162 options[4] Firmware program configuration 163 0 == program 1 (see manual table 5-4) 164 1 == program 2 (see manual table 5-4) 165 2 == program 3 (see manual table 5-4) 166 3 == program 4 (see manual table 5-4) 167 options[5] Analog output 0 range configuration 168 0 == voltage 169 1 == current 170 options[6] Analog output 1 range configuration 171 ... 172 options[12] Analog output 7 range configuration 173 0 == voltage 174 1 == current 175 */ 176 177static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it) 178{ 179 struct comedi_subdevice *s; 180 int i; 181 const struct comedi_lrange *current_range_type, *voltage_range_type; 182 unsigned long iobase; 183 184 iobase = it->options[0]; 185 printk(KERN_INFO "comedi%d: dt2815: 0x%04lx ", dev->minor, iobase); 186 if (!request_region(iobase, DT2815_SIZE, "dt2815")) { 187 printk(KERN_WARNING "I/O port conflict\n"); 188 return -EIO; 189 } 190 191 dev->iobase = iobase; 192 dev->board_name = "dt2815"; 193 194 if (alloc_subdevices(dev, 1) < 0) 195 return -ENOMEM; 196 if (alloc_private(dev, sizeof(struct dt2815_private)) < 0) 197 return -ENOMEM; 198 199 s = dev->subdevices; 200 /* ao subdevice */ 201 s->type = COMEDI_SUBD_AO; 202 s->subdev_flags = SDF_WRITABLE; 203 s->maxdata = 0xfff; 204 s->n_chan = 8; 205 s->insn_write = dt2815_ao_insn; 206 s->insn_read = dt2815_ao_insn_read; 207 s->range_table_list = devpriv->range_type_list; 208 209 current_range_type = (it->options[3]) 210 ? &range_dt2815_ao_20_current : &range_dt2815_ao_32_current; 211 voltage_range_type = (it->options[2]) 212 ? &range_bipolar5 : &range_unipolar5; 213 for (i = 0; i < 8; i++) { 214 devpriv->range_type_list[i] = (it->options[5 + i]) 215 ? current_range_type : voltage_range_type; 216 } 217 218 /* Init the 2815 */ 219 outb(0x00, dev->iobase + DT2815_STATUS); 220 for (i = 0; i < 100; i++) { 221 /* This is incredibly slow (approx 20 ms) */ 222 unsigned int status; 223 224 udelay(1000); 225 status = inb(dev->iobase + DT2815_STATUS); 226 if (status == 4) { 227 unsigned int program; 228 program = (it->options[4] & 0x3) << 3 | 0x7; 229 outb(program, dev->iobase + DT2815_DATA); 230 printk(KERN_INFO ", program: 0x%x (@t=%d)\n", 231 program, i); 232 break; 233 } else if (status != 0x00) { 234 printk(KERN_WARNING "dt2815: unexpected status 0x%x " 235 "(@t=%d)\n", status, i); 236 if (status & 0x60) 237 outb(0x00, dev->iobase + DT2815_STATUS); 238 } 239 } 240 241 return 0; 242} 243 244static void dt2815_free_resources(struct comedi_device *dev) 245{ 246 if (dev->iobase) 247 release_region(dev->iobase, DT2815_SIZE); 248} 249 250static int dt2815_detach(struct comedi_device *dev) 251{ 252 printk(KERN_INFO "comedi%d: dt2815: remove\n", dev->minor); 253 254 dt2815_free_resources(dev); 255 256 return 0; 257} 258 259MODULE_AUTHOR("Comedi http://www.comedi.org"); 260MODULE_DESCRIPTION("Comedi low-level driver"); 261MODULE_LICENSE("GPL"); 262