drivers/staging/comedi/drivers/rti800.c

   1 /*
   2    comedi/drivers/rti800.c
   3    Hardware driver for Analog Devices RTI-800/815 board
   4
   5    COMEDI - Linux Control and Measurement Device Interface
   6    Copyright (C) 1998 David A. Schleef <ds@schleef.org>
   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 Driver: rti800
  25 Description: Analog Devices RTI-800/815
  26 Author: ds
  27 Status: unknown
  28 Updated: Fri, 05 Sep 2008 14:50:44 +0100
  29 Devices: [Analog Devices] RTI-800 (rti800), RTI-815 (rti815)
  30
  31 Configuration options:
  32   [0] - I/O port base address
  33   [1] - IRQ
  34   [2] - A/D reference
  35         0 = differential
  36         1 = pseudodifferential (common)
  37         2 = single-ended
  38   [3] - A/D range
  39         0 = [-10,10]
  40         1 = [-5,5]
  41         2 = [0,10]
  42   [4] - A/D encoding
  43         0 = two's complement
  44         1 = straight binary
  45   [5] - DAC 0 range
  46         0 = [-10,10]
  47         1 = [0,10]
  48   [6] - DAC 0 encoding
  49         0 = two's complement
  50         1 = straight binary
  51   [7] - DAC 1 range (same as DAC 0)
  52   [8] - DAC 1 encoding (same as DAC 0)
  53 */
  54
  55 #include <linux/interrupt.h>
  56 #include "../comedidev.h"
  57
  58 #include <linux/ioport.h>
  59
  60 #define RTI800_SIZE 16
  61
  62 #define RTI800_CSR 0
  63 #define RTI800_MUXGAIN 1
  64 #define RTI800_CONVERT 2
  65 #define RTI800_ADCLO 3
  66 #define RTI800_ADCHI 4
  67 #define RTI800_DAC0LO 5
  68 #define RTI800_DAC0HI 6
  69 #define RTI800_DAC1LO 7
  70 #define RTI800_DAC1HI 8
  71 #define RTI800_CLRFLAGS 9
  72 #define RTI800_DI 10
  73 #define RTI800_DO 11
  74 #define RTI800_9513A_DATA 12
  75 #define RTI800_9513A_CNTRL 13
  76 #define RTI800_9513A_STATUS 13
  77
  78 /*
  79  * flags for CSR register
  80  */
  81
  82 #define RTI800_BUSY             0x80
  83 #define RTI800_DONE             0x40
  84 #define RTI800_OVERRUN          0x20
  85 #define RTI800_TCR              0x10
  86 #define RTI800_DMA_ENAB         0x08
  87 #define RTI800_INTR_TC          0x04
  88 #define RTI800_INTR_EC          0x02
  89 #define RTI800_INTR_OVRN        0x01
  90
  91 #define Am9513_8BITBUS
  92
  93 #define Am9513_output_control(a)        outb(a, dev->iobase+RTI800_9513A_CNTRL)
  94 #define Am9513_output_data(a)           outb(a, dev->iobase+RTI800_9513A_DATA)
  95 #define Am9513_input_data()             inb(dev->iobase+RTI800_9513A_DATA)
  96 #define Am9513_input_status()           inb(dev->iobase+RTI800_9513A_STATUS)
  97
  98 #include "am9513.h"
  99
 100 static const struct comedi_lrange range_rti800_ai_10_bipolar = { 4, {
 101                                                                      BIP_RANGE
 102                                                                      (10),
 103                                                                      BIP_RANGE
 104                                                                      (1),
 105                                                                      BIP_RANGE
 106                                                                      (0.1),
 107                                                                      BIP_RANGE
 108                                                                      (0.02)
 109                                                                      }
 110 };
 111
 112 static const struct comedi_lrange range_rti800_ai_5_bipolar = { 4, {
 113                                                                     BIP_RANGE
 114                                                                     (5),
 115                                                                     BIP_RANGE
 116                                                                     (0.5),
 117                                                                     BIP_RANGE
 118                                                                     (0.05),
 119                                                                     BIP_RANGE
 120                                                                     (0.01)
 121                                                                     }
 122 };
 123
 124 static const struct comedi_lrange range_rti800_ai_unipolar = { 4, {
 125                                                                    UNI_RANGE
 126                                                                    (10),
 127                                                                    UNI_RANGE(1),
 128                                                                    UNI_RANGE
 129                                                                    (0.1),
 130                                                                    UNI_RANGE
 131                                                                    (0.02)
 132                                                                    }
 133 };
 134
 135 struct rti800_board {
 136
 137         const char *name;
 138         int has_ao;
 139 };
 140
 141 static irqreturn_t rti800_interrupt(int irq, void *dev);
 142
 143 struct rti800_private {
 144         enum {
 145                 adc_diff, adc_pseudodiff, adc_singleended
 146         } adc_mux;
 147         enum {
 148                 adc_bipolar10, adc_bipolar5, adc_unipolar10
 149         } adc_range;
 150         enum {
 151                 adc_2comp, adc_straight
 152         } adc_coding;
 153         enum {
 154                 dac_bipolar10, dac_unipolar10
 155         } dac0_range, dac1_range;
 156         enum {
 157                 dac_2comp, dac_straight
 158         } dac0_coding, dac1_coding;
 159         const struct comedi_lrange *ao_range_type_list[2];
 160         unsigned int ao_readback[2];
 161         int muxgain_bits;
 162 };
 163
 164 #define RTI800_TIMEOUT 100
 165
 166 static irqreturn_t rti800_interrupt(int irq, void *dev)
 167 {
 168         return IRQ_HANDLED;
 169 }
 170
 171 /* settling delay times in usec for different gains */
 172 static const int gaindelay[] = { 10, 20, 40, 80 };
 173
 174 static int rti800_ai_insn_read(struct comedi_device *dev,
 175                                struct comedi_subdevice *s,
 176                                struct comedi_insn *insn, unsigned int *data)
 177 {
 178         struct rti800_private *devpriv = dev->private;
 179         int i, t;
 180         int status;
 181         int chan = CR_CHAN(insn->chanspec);
 182         unsigned gain = CR_RANGE(insn->chanspec);
 183         unsigned muxgain_bits;
 184
 185         inb(dev->iobase + RTI800_ADCHI);
 186         outb(0, dev->iobase + RTI800_CLRFLAGS);
 187
 188         muxgain_bits = chan | (gain << 5);
 189         if (muxgain_bits != devpriv->muxgain_bits) {
 190                 devpriv->muxgain_bits = muxgain_bits;
 191                 outb(devpriv->muxgain_bits, dev->iobase + RTI800_MUXGAIN);
 192                 /* without a delay here, the RTI_OVERRUN bit
 193                  * gets set, and you will have an error. */
 194                 if (insn->n > 0) {
 195                         BUG_ON(gain >= ARRAY_SIZE(gaindelay));
 196                         udelay(gaindelay[gain]);
 197                 }
 198         }
 199
 200         for (i = 0; i < insn->n; i++) {
 201                 outb(0, dev->iobase + RTI800_CONVERT);
 202                 for (t = RTI800_TIMEOUT; t; t--) {
 203                         status = inb(dev->iobase + RTI800_CSR);
 204                         if (status & RTI800_OVERRUN) {
 205                                 printk(KERN_WARNING "rti800: a/d overrun\n");
 206                                 outb(0, dev->iobase + RTI800_CLRFLAGS);
 207                                 return -EIO;
 208                         }
 209                         if (status & RTI800_DONE)
 210                                 break;
 211                         udelay(1);
 212                 }
 213                 if (t == 0) {
 214                         printk(KERN_WARNING "rti800: timeout\n");
 215                         return -ETIME;
 216                 }
 217                 data[i] = inb(dev->iobase + RTI800_ADCLO);
 218                 data[i] |= (0xf & inb(dev->iobase + RTI800_ADCHI)) << 8;
 219
 220                 if (devpriv->adc_coding == adc_2comp)
 221                         data[i] ^= 0x800;
 222         }
 223
 224         return i;
 225 }
 226
 227 static int rti800_ao_insn_read(struct comedi_device *dev,
 228                                struct comedi_subdevice *s,
 229                                struct comedi_insn *insn, unsigned int *data)
 230 {
 231         struct rti800_private *devpriv = dev->private;
 232         int i;
 233         int chan = CR_CHAN(insn->chanspec);
 234
 235         for (i = 0; i < insn->n; i++)
 236                 data[i] = devpriv->ao_readback[chan];
 237
 238         return i;
 239 }
 240
 241 static int rti800_ao_insn_write(struct comedi_device *dev,
 242                                 struct comedi_subdevice *s,
 243                                 struct comedi_insn *insn, unsigned int *data)
 244 {
 245         struct rti800_private *devpriv = dev->private;
 246         int chan = CR_CHAN(insn->chanspec);
 247         int d;
 248         int i;
 249
 250         for (i = 0; i < insn->n; i++) {
 251                 devpriv->ao_readback[chan] = d = data[i];
 252                 if (devpriv->dac0_coding == dac_2comp)
 253                         d ^= 0x800;
 254
 255                 outb(d & 0xff,
 256                      dev->iobase + (chan ? RTI800_DAC1LO : RTI800_DAC0LO));
 257                 outb(d >> 8,
 258                      dev->iobase + (chan ? RTI800_DAC1HI : RTI800_DAC0HI));
 259         }
 260         return i;
 261 }
 262
 263 static int rti800_di_insn_bits(struct comedi_device *dev,
 264                                struct comedi_subdevice *s,
 265                                struct comedi_insn *insn, unsigned int *data)
 266 {
 267         data[1] = inb(dev->iobase + RTI800_DI);
 268         return insn->n;
 269 }
 270
 271 static int rti800_do_insn_bits(struct comedi_device *dev,
 272                                struct comedi_subdevice *s,
 273                                struct comedi_insn *insn, unsigned int *data)
 274 {
 275         if (data[0]) {
 276                 s->state &= ~data[0];
 277                 s->state |= data[0] & data[1];
 278                 /* Outputs are inverted... */
 279                 outb(s->state ^ 0xff, dev->iobase + RTI800_DO);
 280         }
 281
 282         data[1] = s->state;
 283
 284         return insn->n;
 285 }
 286
 287 /*
 288    options[0] - I/O port
 289    options[1] - irq
 290    options[2] - a/d mux
 291         0=differential, 1=pseudodiff, 2=single
 292    options[3] - a/d range
 293         0=bipolar10, 1=bipolar5, 2=unipolar10
 294    options[4] - a/d coding
 295         0=2's comp, 1=straight binary
 296    options[5] - dac0 range
 297         0=bipolar10, 1=unipolar10
 298    options[6] - dac0 coding
 299         0=2's comp, 1=straight binary
 300    options[7] - dac1 range
 301    options[8] - dac1 coding
 302  */
 303
 304 static int rti800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 305 {
 306         const struct rti800_board *board = comedi_board(dev);
 307         struct rti800_private *devpriv;
 308         unsigned int irq;
 309         unsigned long iobase;
 310         int ret;
 311         struct comedi_subdevice *s;
 312
 313         iobase = it->options[0];
 314         printk(KERN_INFO "comedi%d: rti800: 0x%04lx\n", dev->minor, iobase);
 315         if (!request_region(iobase, RTI800_SIZE, "rti800")) {
 316                 printk(KERN_WARNING "I/O port conflict\n");
 317                 return -EIO;
 318         }
 319         dev->iobase = iobase;
 320
 321 #ifdef DEBUG
 322         printk(KERN_DEBUG "fingerprint=%x,%x,%x,%x,%x ",
 323                inb(dev->iobase + 0),
 324                inb(dev->iobase + 1),
 325                inb(dev->iobase + 2),
 326                inb(dev->iobase + 3), inb(dev->iobase + 4));
 327 #endif
 328
 329         outb(0, dev->iobase + RTI800_CSR);
 330         inb(dev->iobase + RTI800_ADCHI);
 331         outb(0, dev->iobase + RTI800_CLRFLAGS);
 332
 333         irq = it->options[1];
 334         if (irq) {
 335                 printk(KERN_INFO "( irq = %u )\n", irq);
 336                 ret = request_irq(irq, rti800_interrupt, 0, "rti800", dev);
 337                 if (ret < 0) {
 338                         printk(KERN_WARNING " Failed to allocate IRQ\n");
 339                         return ret;
 340                 }
 341                 dev->irq = irq;
 342         } else {
 343                 printk(KERN_INFO "( no irq )\n");
 344         }
 345
 346         dev->board_name = board->name;
 347
 348         ret = comedi_alloc_subdevices(dev, 4);
 349         if (ret)
 350                 return ret;
 351
 352         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 353         if (!devpriv)
 354                 return -ENOMEM;
 355         dev->private = devpriv;
 356
 357         devpriv->adc_mux = it->options[2];
 358         devpriv->adc_range = it->options[3];
 359         devpriv->adc_coding = it->options[4];
 360         devpriv->dac0_range = it->options[5];
 361         devpriv->dac0_coding = it->options[6];
 362         devpriv->dac1_range = it->options[7];
 363         devpriv->dac1_coding = it->options[8];
 364         devpriv->muxgain_bits = -1;
 365
 366         s = &dev->subdevices[0];
 367         /* ai subdevice */
 368         s->type = COMEDI_SUBD_AI;
 369         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 370         s->n_chan = (devpriv->adc_mux ? 16 : 8);
 371         s->insn_read = rti800_ai_insn_read;
 372         s->maxdata = 0xfff;
 373         switch (devpriv->adc_range) {
 374         case adc_bipolar10:
 375                 s->range_table = &range_rti800_ai_10_bipolar;
 376                 break;
 377         case adc_bipolar5:
 378                 s->range_table = &range_rti800_ai_5_bipolar;
 379                 break;
 380         case adc_unipolar10:
 381                 s->range_table = &range_rti800_ai_unipolar;
 382                 break;
 383         }
 384
 385         s = &dev->subdevices[1];
 386         if (board->has_ao) {
 387                 /* ao subdevice (only on rti815) */
 388                 s->type = COMEDI_SUBD_AO;
 389                 s->subdev_flags = SDF_WRITABLE;
 390                 s->n_chan = 2;
 391                 s->insn_read = rti800_ao_insn_read;
 392                 s->insn_write = rti800_ao_insn_write;
 393                 s->maxdata = 0xfff;
 394                 s->range_table_list = devpriv->ao_range_type_list;
 395                 switch (devpriv->dac0_range) {
 396                 case dac_bipolar10:
 397                         devpriv->ao_range_type_list[0] = &range_bipolar10;
 398                         break;
 399                 case dac_unipolar10:
 400                         devpriv->ao_range_type_list[0] = &range_unipolar10;
 401                         break;
 402                 }
 403                 switch (devpriv->dac1_range) {
 404                 case dac_bipolar10:
 405                         devpriv->ao_range_type_list[1] = &range_bipolar10;
 406                         break;
 407                 case dac_unipolar10:
 408                         devpriv->ao_range_type_list[1] = &range_unipolar10;
 409                         break;
 410                 }
 411         } else {
 412                 s->type = COMEDI_SUBD_UNUSED;
 413         }
 414
 415         s = &dev->subdevices[2];
 416         /* di */
 417         s->type = COMEDI_SUBD_DI;
 418         s->subdev_flags = SDF_READABLE;
 419         s->n_chan = 8;
 420         s->insn_bits = rti800_di_insn_bits;
 421         s->maxdata = 1;
 422         s->range_table = &range_digital;
 423
 424         s = &dev->subdevices[3];
 425         /* do */
 426         s->type = COMEDI_SUBD_DO;
 427         s->subdev_flags = SDF_WRITABLE;
 428         s->n_chan = 8;
 429         s->insn_bits = rti800_do_insn_bits;
 430         s->maxdata = 1;
 431         s->range_table = &range_digital;
 432
 433 /* don't yet know how to deal with counter/timers */
 434 #if 0
 435         s = &dev->subdevices[4];
 436         /* do */
 437         s->type = COMEDI_SUBD_TIMER;
 438 #endif
 439
 440         return 0;
 441 }
 442
 443 static void rti800_detach(struct comedi_device *dev)
 444 {
 445         if (dev->iobase)
 446                 release_region(dev->iobase, RTI800_SIZE);
 447         if (dev->irq)
 448                 free_irq(dev->irq, dev);
 449 }
 450
 451 static const struct rti800_board boardtypes[] = {
 452         { "rti800", 0 },
 453         { "rti815", 1 },
 454 };
 455
 456 static struct comedi_driver rti800_driver = {
 457         .driver_name    = "rti800",
 458         .module         = THIS_MODULE,
 459         .attach         = rti800_attach,
 460         .detach         = rti800_detach,
 461         .num_names      = ARRAY_SIZE(boardtypes),
 462         .board_name     = &boardtypes[0].name,
 463         .offset         = sizeof(struct rti800_board),
 464 };
 465 module_comedi_driver(rti800_driver);
 466
 467 MODULE_AUTHOR("Comedi http://www.comedi.org");
 468 MODULE_DESCRIPTION("Comedi low-level driver");
 469 MODULE_LICENSE("GPL");