dt2815.c revision 7114a28011f9d5f3d981731ad341177c21f9d948
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 85static int __init driver_dt2815_init_module(void) 86{ 87 return comedi_driver_register(&driver_dt2815); 88} 89 90static void __exit driver_dt2815_cleanup_module(void) 91{ 92 comedi_driver_unregister(&driver_dt2815); 93} 94 95module_init(driver_dt2815_init_module); 96module_exit(driver_dt2815_cleanup_module); 97 98static void dt2815_free_resources(struct comedi_device *dev); 99 100struct dt2815_private { 101 102 const struct comedi_lrange *range_type_list[8]; 103 unsigned int ao_readback[8]; 104}; 105 106#define devpriv ((struct dt2815_private *)dev->private) 107 108static int dt2815_wait_for_status(struct comedi_device *dev, int status) 109{ 110 int i; 111 112 for (i = 0; i < 100; i++) { 113 if (inb(dev->iobase + DT2815_STATUS) == status) 114 break; 115 } 116 return status; 117} 118 119static int dt2815_ao_insn_read(struct comedi_device *dev, 120 struct comedi_subdevice *s, 121 struct comedi_insn *insn, unsigned int *data) 122{ 123 int i; 124 int chan = CR_CHAN(insn->chanspec); 125 126 for (i = 0; i < insn->n; i++) 127 data[i] = devpriv->ao_readback[chan]; 128 129 return i; 130} 131 132static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s, 133 struct comedi_insn *insn, unsigned int *data) 134{ 135 int i; 136 int chan = CR_CHAN(insn->chanspec); 137 unsigned int status; 138 unsigned int lo, hi; 139 140 for (i = 0; i < insn->n; i++) { 141 lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01; 142 hi = (data[i] & 0xff0) >> 4; 143 144 status = dt2815_wait_for_status(dev, 0x00); 145 if (status != 0) { 146 printk(KERN_WARNING "dt2815: failed to write low byte " 147 "on %d reason %x\n", chan, status); 148 return -EBUSY; 149 } 150 151 outb(lo, dev->iobase + DT2815_DATA); 152 153 status = dt2815_wait_for_status(dev, 0x10); 154 if (status != 0x10) { 155 printk(KERN_WARNING "dt2815: failed to write high byte " 156 "on %d reason %x\n", chan, status); 157 return -EBUSY; 158 } 159 devpriv->ao_readback[chan] = data[i]; 160 } 161 return i; 162} 163 164/* 165 options[0] Board base address 166 options[1] IRQ (not applicable) 167 options[2] Voltage unipolar/bipolar configuration 168 0 == unipolar 5V (0V -- +5V) 169 1 == bipolar 5V (-5V -- +5V) 170 options[3] Current offset configuration 171 0 == disabled (0mA -- +32mAV) 172 1 == enabled (+4mA -- +20mAV) 173 options[4] Firmware program configuration 174 0 == program 1 (see manual table 5-4) 175 1 == program 2 (see manual table 5-4) 176 2 == program 3 (see manual table 5-4) 177 3 == program 4 (see manual table 5-4) 178 options[5] Analog output 0 range configuration 179 0 == voltage 180 1 == current 181 options[6] Analog output 1 range configuration 182 ... 183 options[12] Analog output 7 range configuration 184 0 == voltage 185 1 == current 186 */ 187 188static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it) 189{ 190 struct comedi_subdevice *s; 191 int i; 192 const struct comedi_lrange *current_range_type, *voltage_range_type; 193 unsigned long iobase; 194 195 iobase = it->options[0]; 196 printk(KERN_INFO "comedi%d: dt2815: 0x%04lx ", dev->minor, iobase); 197 if (!request_region(iobase, DT2815_SIZE, "dt2815")) { 198 printk(KERN_WARNING "I/O port conflict\n"); 199 return -EIO; 200 } 201 202 dev->iobase = iobase; 203 dev->board_name = "dt2815"; 204 205 if (alloc_subdevices(dev, 1) < 0) 206 return -ENOMEM; 207 if (alloc_private(dev, sizeof(struct dt2815_private)) < 0) 208 return -ENOMEM; 209 210 s = dev->subdevices; 211 /* ao subdevice */ 212 s->type = COMEDI_SUBD_AO; 213 s->subdev_flags = SDF_WRITABLE; 214 s->maxdata = 0xfff; 215 s->n_chan = 8; 216 s->insn_write = dt2815_ao_insn; 217 s->insn_read = dt2815_ao_insn_read; 218 s->range_table_list = devpriv->range_type_list; 219 220 current_range_type = (it->options[3]) 221 ? &range_dt2815_ao_20_current : &range_dt2815_ao_32_current; 222 voltage_range_type = (it->options[2]) 223 ? &range_bipolar5 : &range_unipolar5; 224 for (i = 0; i < 8; i++) { 225 devpriv->range_type_list[i] = (it->options[5 + i]) 226 ? current_range_type : voltage_range_type; 227 } 228 229 /* Init the 2815 */ 230 outb(0x00, dev->iobase + DT2815_STATUS); 231 for (i = 0; i < 100; i++) { 232 /* This is incredibly slow (approx 20 ms) */ 233 unsigned int status; 234 235 udelay(1000); 236 status = inb(dev->iobase + DT2815_STATUS); 237 if (status == 4) { 238 unsigned int program; 239 program = (it->options[4] & 0x3) << 3 | 0x7; 240 outb(program, dev->iobase + DT2815_DATA); 241 printk(KERN_INFO ", program: 0x%x (@t=%d)\n", 242 program, i); 243 break; 244 } else if (status != 0x00) { 245 printk(KERN_WARNING "dt2815: unexpected status 0x%x " 246 "(@t=%d)\n", status, i); 247 if (status & 0x60) 248 outb(0x00, dev->iobase + DT2815_STATUS); 249 } 250 } 251 252 return 0; 253} 254 255static void dt2815_free_resources(struct comedi_device *dev) 256{ 257 if (dev->iobase) 258 release_region(dev->iobase, DT2815_SIZE); 259} 260 261static int dt2815_detach(struct comedi_device *dev) 262{ 263 printk(KERN_INFO "comedi%d: dt2815: remove\n", dev->minor); 264 265 dt2815_free_resources(dev); 266 267 return 0; 268} 269 270MODULE_AUTHOR("Comedi http://www.comedi.org"); 271MODULE_DESCRIPTION("Comedi low-level driver"); 272MODULE_LICENSE("GPL"); 273