drivers/staging/comedi/drivers/aio_aio12_8.c

   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     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
  25 Driver: aio_aio12_8
  26 Description: Access I/O Products PC-104 AIO12-8 Analog I/O Board
  27 Author: Pablo Mejia <pablo.mejia@cctechnol.com>
  28 Devices: [Access I/O] PC-104 AIO12-8 (aio_aio12_8)
  29          [Access I/O] PC-104 AI12-8 (aio_ai12_8)
  30          [Access I/O] PC-104 AO12-8 (aio_ao12_8)
  31 Status: experimental
  32
  33 Configuration Options:
  34   [0] - I/O port base address
  35
  36 Notes:
  37
  38   Only synchronous operations are supported.
  39
  40 */
  41
  42 #include "../comedidev.h"
  43 #include <linux/ioport.h>
  44 #include "8255.h"
  45
  46 /*
  47  * Register map
  48  */
  49 #define AIO12_8_STATUS_REG              0x00
  50 #define AIO12_8_STATUS_ADC_EOC          (1 << 7)
  51 #define AIO12_8_STATUS_PORT_C_COS       (1 << 6)
  52 #define AIO12_8_STATUS_IRQ_ENA          (1 << 2)
  53 #define AIO12_8_INTERRUPT_REG           0x01
  54 #define AIO12_8_INTERRUPT_ADC           (1 << 7)
  55 #define AIO12_8_INTERRUPT_COS           (1 << 6)
  56 #define AIO12_8_INTERRUPT_COUNTER1      (1 << 5)
  57 #define AIO12_8_INTERRUPT_PORT_C3       (1 << 4)
  58 #define AIO12_8_INTERRUPT_PORT_C0       (1 << 3)
  59 #define AIO12_8_INTERRUPT_ENA           (1 << 2)
  60 #define AIO12_8_ADC_REG                 0x02
  61 #define AIO12_8_ADC_MODE_NORMAL         (0 << 6)
  62 #define AIO12_8_ADC_MODE_INT_CLK        (1 << 6)
  63 #define AIO12_8_ADC_MODE_STANDBY        (2 << 6)
  64 #define AIO12_8_ADC_MODE_POWERDOWN      (3 << 6)
  65 #define AIO12_8_ADC_ACQ_3USEC           (0 << 5)
  66 #define AIO12_8_ADC_ACQ_PROGRAM         (1 << 5)
  67 #define AIO12_8_ADC_RANGE(x)            ((x) << 3)
  68 #define AIO12_8_ADC_CHAN(x)             ((x) << 0)
  69 #define AIO12_8_DAC_REG(x)              (0x04 + (x) * 2)
  70 #define AIO12_8_8254_BASE_REG           0x0c
  71 #define AIO12_8_8255_BASE_REG           0x10
  72 #define AIO12_8_DIO_CONTROL_REG         0x14
  73 #define AIO12_8_DIO_CONTROL_TST         (1 << 0)
  74 #define AIO12_8_ADC_TRIGGER_REG         0x15
  75 #define AIO12_8_ADC_TRIGGER_RANGE(x)    ((x) << 3)
  76 #define AIO12_8_ADC_TRIGGER_CHAN(x)     ((x) << 0)
  77 #define AIO12_8_TRIGGER_REG             0x16
  78 #define AIO12_8_TRIGGER_ADTRIG          (1 << 1)
  79 #define AIO12_8_TRIGGER_DACTRIG         (1 << 0)
  80 #define AIO12_8_COS_REG                 0x17
  81 #define AIO12_8_DAC_ENABLE_REG          0x18
  82 #define AIO12_8_DAC_ENABLE_REF_ENA      (1 << 0)
  83
  84 struct aio12_8_boardtype {
  85         const char *name;
  86         int ai_nchan;
  87         int ao_nchan;
  88 };
  89
  90 static const struct aio12_8_boardtype board_types[] = {
  91         {
  92                 .name           = "aio_aio12_8",
  93                 .ai_nchan       = 8,
  94                 .ao_nchan       = 4,
  95         }, {
  96                 .name           = "aio_ai12_8",
  97                 .ai_nchan       = 8,
  98         }, {
  99                 .name           = "aio_ao12_8",
 100                 .ao_nchan       = 4,
 101         },
 102 };
 103
 104 struct aio12_8_private {
 105         unsigned int ao_readback[4];
 106 };
 107
 108 static int aio_aio12_8_ai_read(struct comedi_device *dev,
 109                                struct comedi_subdevice *s,
 110                                struct comedi_insn *insn, unsigned int *data)
 111 {
 112         unsigned int chan = CR_CHAN(insn->chanspec);
 113         unsigned int range = CR_RANGE(insn->chanspec);
 114         unsigned int val;
 115         unsigned char control;
 116         int n;
 117
 118         /*
 119          * Setup the control byte for internal 2MHz clock, 3uS conversion,
 120          * at the desired range of the requested channel.
 121          */
 122         control = AIO12_8_ADC_MODE_NORMAL | AIO12_8_ADC_ACQ_3USEC |
 123                   AIO12_8_ADC_RANGE(range) | AIO12_8_ADC_CHAN(chan);
 124
 125         /* Read status to clear EOC latch */
 126         inb(dev->iobase + AIO12_8_STATUS_REG);
 127
 128         for (n = 0; n < insn->n; n++) {
 129                 int timeout = 5;
 130
 131                 /*  Setup and start conversion */
 132                 outb(control, dev->iobase + AIO12_8_ADC_REG);
 133
 134                 /*  Wait for conversion to complete */
 135                 do {
 136                         val = inb(dev->iobase + AIO12_8_STATUS_REG);
 137                         timeout--;
 138                         if (timeout == 0) {
 139                                 dev_err(dev->class_dev, "ADC timeout\n");
 140                                 return -ETIMEDOUT;
 141                         }
 142                 } while (!(val & AIO12_8_STATUS_ADC_EOC));
 143
 144                 data[n] = inw(dev->iobase + AIO12_8_ADC_REG) & s->maxdata;
 145         }
 146
 147         return insn->n;
 148 }
 149
 150 static int aio_aio12_8_ao_read(struct comedi_device *dev,
 151                                struct comedi_subdevice *s,
 152                                struct comedi_insn *insn, unsigned int *data)
 153 {
 154         struct aio12_8_private *devpriv = dev->private;
 155         unsigned int chan = CR_CHAN(insn->chanspec);
 156         int val = devpriv->ao_readback[chan];
 157         int i;
 158
 159         for (i = 0; i < insn->n; i++)
 160                 data[i] = val;
 161         return insn->n;
 162 }
 163
 164 static int aio_aio12_8_ao_write(struct comedi_device *dev,
 165                                 struct comedi_subdevice *s,
 166                                 struct comedi_insn *insn, unsigned int *data)
 167 {
 168         struct aio12_8_private *devpriv = dev->private;
 169         unsigned int chan = CR_CHAN(insn->chanspec);
 170         unsigned long port = dev->iobase + AIO12_8_DAC_REG(chan);
 171         unsigned int val = 0;
 172         int i;
 173
 174         /* enable DACs */
 175         outb(AIO12_8_DAC_ENABLE_REF_ENA, dev->iobase + AIO12_8_DAC_ENABLE_REG);
 176
 177         for (i = 0; i < insn->n; i++) {
 178                 val = data[i];
 179                 outw(val, port);
 180         }
 181
 182         devpriv->ao_readback[chan] = val;
 183
 184         return insn->n;
 185 }
 186
 187 static const struct comedi_lrange range_aio_aio12_8 = {
 188         4,
 189         {
 190          UNI_RANGE(5),
 191          BIP_RANGE(5),
 192          UNI_RANGE(10),
 193          BIP_RANGE(10),
 194          }
 195 };
 196
 197 static int aio_aio12_8_attach(struct comedi_device *dev,
 198                               struct comedi_devconfig *it)
 199 {
 200         const struct aio12_8_boardtype *board = comedi_board(dev);
 201         struct aio12_8_private *devpriv;
 202         struct comedi_subdevice *s;
 203         int ret;
 204
 205         ret = comedi_request_region(dev, it->options[0], 32);
 206         if (ret)
 207                 return ret;
 208
 209         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 210         if (!devpriv)
 211                 return -ENOMEM;
 212         dev->private = devpriv;
 213
 214         ret = comedi_alloc_subdevices(dev, 4);
 215         if (ret)
 216                 return ret;
 217
 218         s = &dev->subdevices[0];
 219         if (board->ai_nchan) {
 220                 /* Analog input subdevice */
 221                 s->type         = COMEDI_SUBD_AI;
 222                 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
 223                 s->n_chan       = board->ai_nchan;
 224                 s->maxdata      = 0x0fff;
 225                 s->range_table  = &range_aio_aio12_8;
 226                 s->insn_read    = aio_aio12_8_ai_read;
 227         } else {
 228                 s->type = COMEDI_SUBD_UNUSED;
 229         }
 230
 231         s = &dev->subdevices[1];
 232         if (board->ao_nchan) {
 233                 /* Analog output subdevice */
 234                 s->type         = COMEDI_SUBD_AO;
 235                 s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_DIFF;
 236                 s->n_chan       = 4;
 237                 s->maxdata      = 0x0fff;
 238                 s->range_table  = &range_aio_aio12_8;
 239                 s->insn_read    = aio_aio12_8_ao_read;
 240                 s->insn_write   = aio_aio12_8_ao_write;
 241         } else {
 242                 s->type = COMEDI_SUBD_UNUSED;
 243         }
 244
 245         s = &dev->subdevices[2];
 246         /* 8255 Digital i/o subdevice */
 247         ret = subdev_8255_init(dev, s, NULL,
 248                                dev->iobase + AIO12_8_8255_BASE_REG);
 249         if (ret)
 250                 return ret;
 251
 252         s = &dev->subdevices[3];
 253         /* 8254 counter/timer subdevice */
 254         s->type         = COMEDI_SUBD_UNUSED;
 255
 256         dev_info(dev->class_dev, "%s: %s attached\n",
 257                 dev->driver->driver_name, dev->board_name);
 258
 259         return 0;
 260 }
 261
 262 static void aio_aio12_8_detach(struct comedi_device *dev)
 263 {
 264         comedi_spriv_free(dev, 2);
 265         comedi_legacy_detach(dev);
 266 }
 267
 268 static struct comedi_driver aio_aio12_8_driver = {
 269         .driver_name    = "aio_aio12_8",
 270         .module         = THIS_MODULE,
 271         .attach         = aio_aio12_8_attach,
 272         .detach         = aio_aio12_8_detach,
 273         .board_name     = &board_types[0].name,
 274         .num_names      = ARRAY_SIZE(board_types),
 275         .offset         = sizeof(struct aio12_8_boardtype),
 276 };
 277 module_comedi_driver(aio_aio12_8_driver);
 278
 279 MODULE_AUTHOR("Comedi http://www.comedi.org");
 280 MODULE_DESCRIPTION("Comedi low-level driver");
 281 MODULE_LICENSE("GPL");