aio_aio12_8.c revision 90f703d30dd3e0c16ff80f35e34e511385a05ad5
1/* 2 3 comedi/drivers/aio_aio12_8.c 4 5 Driver for Acces I/O Products PC-104 AIO12-8 Analog I/O Board 6 Copyright (C) 2006 C&C Technologies, Inc. 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/* 24 25Driver: aio_aio12_8 26Description: Acces I/O Products PC-104 AIO12-8 Analog I/O Board 27Author: Pablo Mejia <pablo.mejia@cctechnol.com> 28Devices: 29 [Acces I/O] PC-104 AIO12-8 30Status: experimental 31 32Configuration Options: 33 [0] - I/O port base address 34 35Notes: 36 37 Only synchronous operations are supported. 38 39*/ 40 41#include "../comedidev.h" 42#include <linux/ioport.h> 43#include "8255.h" 44 45#define AIO12_8_STATUS 0x00 46#define AIO12_8_INTERRUPT 0x01 47#define AIO12_8_ADC 0x02 48#define AIO12_8_DAC_0 0x04 49#define AIO12_8_DAC_1 0x06 50#define AIO12_8_DAC_2 0x08 51#define AIO12_8_DAC_3 0x0A 52#define AIO12_8_COUNTER_0 0x0C 53#define AIO12_8_COUNTER_1 0x0D 54#define AIO12_8_COUNTER_2 0x0E 55#define AIO12_8_COUNTER_CONTROL 0x0F 56#define AIO12_8_DIO_0 0x10 57#define AIO12_8_DIO_1 0x11 58#define AIO12_8_DIO_2 0x12 59#define AIO12_8_DIO_STATUS 0x13 60#define AIO12_8_DIO_CONTROL 0x14 61#define AIO12_8_ADC_TRIGGER_CONTROL 0x15 62#define AIO12_8_TRIGGER 0x16 63#define AIO12_8_POWER 0x17 64 65#define STATUS_ADC_EOC 0x80 66 67#define ADC_MODE_NORMAL 0x00 68#define ADC_MODE_INTERNAL_CLOCK 0x40 69#define ADC_MODE_STANDBY 0x80 70#define ADC_MODE_POWERDOWN 0xC0 71 72#define DAC_ENABLE 0x18 73 74struct aio12_8_boardtype { 75 const char *name; 76}; 77 78static const struct aio12_8_boardtype board_types[] = { 79 { 80 .name = "aio_aio12_8"}, 81}; 82 83#define thisboard ((const struct aio12_8_boardtype *) dev->board_ptr) 84 85struct aio12_8_private { 86 unsigned int ao_readback[4]; 87}; 88 89#define devpriv ((struct aio12_8_private *) dev->private) 90 91static int aio_aio12_8_ai_read(struct comedi_device *dev, 92 struct comedi_subdevice *s, 93 struct comedi_insn *insn, unsigned int *data) 94{ 95 int n; 96 unsigned char control = 97 ADC_MODE_NORMAL | 98 (CR_RANGE(insn->chanspec) << 3) | CR_CHAN(insn->chanspec); 99 100 /* read status to clear EOC latch */ 101 inb(dev->iobase + AIO12_8_STATUS); 102 103 for (n = 0; n < insn->n; n++) { 104 int timeout = 5; 105 106 /* Setup and start conversion */ 107 outb(control, dev->iobase + AIO12_8_ADC); 108 109 /* Wait for conversion to complete */ 110 while (timeout && 111 !(inb(dev->iobase + AIO12_8_STATUS) & STATUS_ADC_EOC)) { 112 timeout--; 113 printk(KERN_ERR "timeout %d\n", timeout); 114 udelay(1); 115 } 116 if (timeout == 0) { 117 comedi_error(dev, "ADC timeout"); 118 return -EIO; 119 } 120 121 data[n] = inw(dev->iobase + AIO12_8_ADC) & 0x0FFF; 122 } 123 return n; 124} 125 126static int aio_aio12_8_ao_read(struct comedi_device *dev, 127 struct comedi_subdevice *s, 128 struct comedi_insn *insn, unsigned int *data) 129{ 130 int i; 131 int val = devpriv->ao_readback[CR_CHAN(insn->chanspec)]; 132 133 for (i = 0; i < insn->n; i++) 134 data[i] = val; 135 return insn->n; 136} 137 138static int aio_aio12_8_ao_write(struct comedi_device *dev, 139 struct comedi_subdevice *s, 140 struct comedi_insn *insn, unsigned int *data) 141{ 142 int i; 143 int chan = CR_CHAN(insn->chanspec); 144 unsigned long port = dev->iobase + AIO12_8_DAC_0 + (2 * chan); 145 146 /* enable DACs */ 147 outb(0x01, dev->iobase + DAC_ENABLE); 148 149 for (i = 0; i < insn->n; i++) { 150 outb(data[i] & 0xFF, port); /* LSB */ 151 outb((data[i] >> 8) & 0x0F, port + 1); /* MSB */ 152 devpriv->ao_readback[chan] = data[i]; 153 } 154 return insn->n; 155} 156 157static const struct comedi_lrange range_aio_aio12_8 = { 158 4, 159 { 160 UNI_RANGE(5), 161 BIP_RANGE(5), 162 UNI_RANGE(10), 163 BIP_RANGE(10), 164 } 165}; 166 167static int aio_aio12_8_attach(struct comedi_device *dev, 168 struct comedi_devconfig *it) 169{ 170 int iobase; 171 struct comedi_subdevice *s; 172 173 iobase = it->options[0]; 174 if (!request_region(iobase, 24, "aio_aio12_8")) { 175 printk(KERN_ERR "I/O port conflict"); 176 return -EIO; 177 } 178 179 dev->board_name = thisboard->name; 180 181 dev->iobase = iobase; 182 183 if (alloc_private(dev, sizeof(struct aio12_8_private)) < 0) 184 return -ENOMEM; 185 186 if (alloc_subdevices(dev, 3) < 0) 187 return -ENOMEM; 188 189 s = &dev->subdevices[0]; 190 s->type = COMEDI_SUBD_AI; 191 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF; 192 s->n_chan = 8; 193 s->maxdata = (1 << 12) - 1; 194 s->range_table = &range_aio_aio12_8; 195 s->insn_read = aio_aio12_8_ai_read; 196 197 s = &dev->subdevices[1]; 198 s->type = COMEDI_SUBD_AO; 199 s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF; 200 s->n_chan = 4; 201 s->maxdata = (1 << 12) - 1; 202 s->range_table = &range_aio_aio12_8; 203 s->insn_read = aio_aio12_8_ao_read; 204 s->insn_write = aio_aio12_8_ao_write; 205 206 s = &dev->subdevices[2]; 207 subdev_8255_init(dev, s, NULL, dev->iobase + AIO12_8_DIO_0); 208 209 return 0; 210} 211 212static int aio_aio12_8_detach(struct comedi_device *dev) 213{ 214 subdev_8255_cleanup(dev, &dev->subdevices[2]); 215 if (dev->iobase) 216 release_region(dev->iobase, 24); 217 return 0; 218} 219 220static struct comedi_driver driver_aio_aio12_8 = { 221 .driver_name = "aio_aio12_8", 222 .module = THIS_MODULE, 223 .attach = aio_aio12_8_attach, 224 .detach = aio_aio12_8_detach, 225 .board_name = &board_types[0].name, 226 .num_names = 1, 227 .offset = sizeof(struct aio12_8_boardtype), 228}; 229 230COMEDI_INITCLEANUP(driver_aio_aio12_8); 231 232MODULE_AUTHOR("Comedi http://www.comedi.org"); 233MODULE_DESCRIPTION("Comedi low-level driver"); 234MODULE_LICENSE("GPL"); 235