1/* 2 3 comedi/drivers/aio_aio12_8.c 4 5 Driver for Access 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 19/* 20 21Driver: aio_aio12_8 22Description: Access I/O Products PC-104 AIO12-8 Analog I/O Board 23Author: Pablo Mejia <pablo.mejia@cctechnol.com> 24Devices: [Access I/O] PC-104 AIO12-8 (aio_aio12_8) 25 [Access I/O] PC-104 AI12-8 (aio_ai12_8) 26 [Access I/O] PC-104 AO12-8 (aio_ao12_8) 27Status: experimental 28 29Configuration Options: 30 [0] - I/O port base address 31 32Notes: 33 34 Only synchronous operations are supported. 35 36*/ 37 38#include <linux/module.h> 39#include "../comedidev.h" 40#include "8255.h" 41 42/* 43 * Register map 44 */ 45#define AIO12_8_STATUS_REG 0x00 46#define AIO12_8_STATUS_ADC_EOC (1 << 7) 47#define AIO12_8_STATUS_PORT_C_COS (1 << 6) 48#define AIO12_8_STATUS_IRQ_ENA (1 << 2) 49#define AIO12_8_INTERRUPT_REG 0x01 50#define AIO12_8_INTERRUPT_ADC (1 << 7) 51#define AIO12_8_INTERRUPT_COS (1 << 6) 52#define AIO12_8_INTERRUPT_COUNTER1 (1 << 5) 53#define AIO12_8_INTERRUPT_PORT_C3 (1 << 4) 54#define AIO12_8_INTERRUPT_PORT_C0 (1 << 3) 55#define AIO12_8_INTERRUPT_ENA (1 << 2) 56#define AIO12_8_ADC_REG 0x02 57#define AIO12_8_ADC_MODE_NORMAL (0 << 6) 58#define AIO12_8_ADC_MODE_INT_CLK (1 << 6) 59#define AIO12_8_ADC_MODE_STANDBY (2 << 6) 60#define AIO12_8_ADC_MODE_POWERDOWN (3 << 6) 61#define AIO12_8_ADC_ACQ_3USEC (0 << 5) 62#define AIO12_8_ADC_ACQ_PROGRAM (1 << 5) 63#define AIO12_8_ADC_RANGE(x) ((x) << 3) 64#define AIO12_8_ADC_CHAN(x) ((x) << 0) 65#define AIO12_8_DAC_REG(x) (0x04 + (x) * 2) 66#define AIO12_8_8254_BASE_REG 0x0c 67#define AIO12_8_8255_BASE_REG 0x10 68#define AIO12_8_DIO_CONTROL_REG 0x14 69#define AIO12_8_DIO_CONTROL_TST (1 << 0) 70#define AIO12_8_ADC_TRIGGER_REG 0x15 71#define AIO12_8_ADC_TRIGGER_RANGE(x) ((x) << 3) 72#define AIO12_8_ADC_TRIGGER_CHAN(x) ((x) << 0) 73#define AIO12_8_TRIGGER_REG 0x16 74#define AIO12_8_TRIGGER_ADTRIG (1 << 1) 75#define AIO12_8_TRIGGER_DACTRIG (1 << 0) 76#define AIO12_8_COS_REG 0x17 77#define AIO12_8_DAC_ENABLE_REG 0x18 78#define AIO12_8_DAC_ENABLE_REF_ENA (1 << 0) 79 80struct aio12_8_boardtype { 81 const char *name; 82 int ai_nchan; 83 int ao_nchan; 84}; 85 86static const struct aio12_8_boardtype board_types[] = { 87 { 88 .name = "aio_aio12_8", 89 .ai_nchan = 8, 90 .ao_nchan = 4, 91 }, { 92 .name = "aio_ai12_8", 93 .ai_nchan = 8, 94 }, { 95 .name = "aio_ao12_8", 96 .ao_nchan = 4, 97 }, 98}; 99 100static int aio_aio12_8_ai_eoc(struct comedi_device *dev, 101 struct comedi_subdevice *s, 102 struct comedi_insn *insn, 103 unsigned long context) 104{ 105 unsigned int status; 106 107 status = inb(dev->iobase + AIO12_8_STATUS_REG); 108 if (status & AIO12_8_STATUS_ADC_EOC) 109 return 0; 110 return -EBUSY; 111} 112 113static int aio_aio12_8_ai_read(struct comedi_device *dev, 114 struct comedi_subdevice *s, 115 struct comedi_insn *insn, unsigned int *data) 116{ 117 unsigned int chan = CR_CHAN(insn->chanspec); 118 unsigned int range = CR_RANGE(insn->chanspec); 119 unsigned char control; 120 int ret; 121 int n; 122 123 /* 124 * Setup the control byte for internal 2MHz clock, 3uS conversion, 125 * at the desired range of the requested channel. 126 */ 127 control = AIO12_8_ADC_MODE_NORMAL | AIO12_8_ADC_ACQ_3USEC | 128 AIO12_8_ADC_RANGE(range) | AIO12_8_ADC_CHAN(chan); 129 130 /* Read status to clear EOC latch */ 131 inb(dev->iobase + AIO12_8_STATUS_REG); 132 133 for (n = 0; n < insn->n; n++) { 134 /* Setup and start conversion */ 135 outb(control, dev->iobase + AIO12_8_ADC_REG); 136 137 /* Wait for conversion to complete */ 138 ret = comedi_timeout(dev, s, insn, aio_aio12_8_ai_eoc, 0); 139 if (ret) 140 return ret; 141 142 data[n] = inw(dev->iobase + AIO12_8_ADC_REG) & s->maxdata; 143 } 144 145 return insn->n; 146} 147 148static int aio_aio12_8_ao_insn_write(struct comedi_device *dev, 149 struct comedi_subdevice *s, 150 struct comedi_insn *insn, 151 unsigned int *data) 152{ 153 unsigned int chan = CR_CHAN(insn->chanspec); 154 unsigned int val = s->readback[chan]; 155 int i; 156 157 /* enable DACs */ 158 outb(AIO12_8_DAC_ENABLE_REF_ENA, dev->iobase + AIO12_8_DAC_ENABLE_REG); 159 160 for (i = 0; i < insn->n; i++) { 161 val = data[i]; 162 outw(val, dev->iobase + AIO12_8_DAC_REG(chan)); 163 } 164 s->readback[chan] = val; 165 166 return insn->n; 167} 168 169static const struct comedi_lrange range_aio_aio12_8 = { 170 4, { 171 UNI_RANGE(5), 172 BIP_RANGE(5), 173 UNI_RANGE(10), 174 BIP_RANGE(10) 175 } 176}; 177 178static int aio_aio12_8_attach(struct comedi_device *dev, 179 struct comedi_devconfig *it) 180{ 181 const struct aio12_8_boardtype *board = dev->board_ptr; 182 struct comedi_subdevice *s; 183 int ret; 184 185 ret = comedi_request_region(dev, it->options[0], 32); 186 if (ret) 187 return ret; 188 189 ret = comedi_alloc_subdevices(dev, 4); 190 if (ret) 191 return ret; 192 193 s = &dev->subdevices[0]; 194 if (board->ai_nchan) { 195 /* Analog input subdevice */ 196 s->type = COMEDI_SUBD_AI; 197 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF; 198 s->n_chan = board->ai_nchan; 199 s->maxdata = 0x0fff; 200 s->range_table = &range_aio_aio12_8; 201 s->insn_read = aio_aio12_8_ai_read; 202 } else { 203 s->type = COMEDI_SUBD_UNUSED; 204 } 205 206 s = &dev->subdevices[1]; 207 if (board->ao_nchan) { 208 /* Analog output subdevice */ 209 s->type = COMEDI_SUBD_AO; 210 s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF; 211 s->n_chan = 4; 212 s->maxdata = 0x0fff; 213 s->range_table = &range_aio_aio12_8; 214 s->insn_write = aio_aio12_8_ao_insn_write; 215 s->insn_read = comedi_readback_insn_read; 216 217 ret = comedi_alloc_subdev_readback(s); 218 if (ret) 219 return ret; 220 } else { 221 s->type = COMEDI_SUBD_UNUSED; 222 } 223 224 s = &dev->subdevices[2]; 225 /* 8255 Digital i/o subdevice */ 226 ret = subdev_8255_init(dev, s, NULL, AIO12_8_8255_BASE_REG); 227 if (ret) 228 return ret; 229 230 s = &dev->subdevices[3]; 231 /* 8254 counter/timer subdevice */ 232 s->type = COMEDI_SUBD_UNUSED; 233 234 return 0; 235} 236 237static struct comedi_driver aio_aio12_8_driver = { 238 .driver_name = "aio_aio12_8", 239 .module = THIS_MODULE, 240 .attach = aio_aio12_8_attach, 241 .detach = comedi_legacy_detach, 242 .board_name = &board_types[0].name, 243 .num_names = ARRAY_SIZE(board_types), 244 .offset = sizeof(struct aio12_8_boardtype), 245}; 246module_comedi_driver(aio_aio12_8_driver); 247 248MODULE_AUTHOR("Comedi http://www.comedi.org"); 249MODULE_DESCRIPTION("Comedi low-level driver"); 250MODULE_LICENSE("GPL"); 251