linux/drivers/comedi/drivers/das08.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * comedi/drivers/das08.c
   4 * comedi module for common DAS08 support (used by ISA/PCI/PCMCIA drivers)
   5 *
   6 * COMEDI - Linux Control and Measurement Device Interface
   7 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   8 * Copyright (C) 2001,2002,2003 Frank Mori Hess <fmhess@users.sourceforge.net>
   9 * Copyright (C) 2004 Salvador E. Tropea <set@users.sf.net> <set@ieee.org>
  10 */
  11
  12#include <linux/module.h>
  13
  14#include "../comedidev.h"
  15
  16#include "8255.h"
  17#include "comedi_8254.h"
  18#include "das08.h"
  19
  20/*
  21 * Data format of DAS08_AI_LSB_REG and DAS08_AI_MSB_REG depends on
  22 * 'ai_encoding' member of board structure:
  23 *
  24 * das08_encode12     : DATA[11..4] = MSB[7..0], DATA[3..0] = LSB[7..4].
  25 * das08_pcm_encode12 : DATA[11..8] = MSB[3..0], DATA[7..9] = LSB[7..0].
  26 * das08_encode16     : SIGN = MSB[7], MAGNITUDE[14..8] = MSB[6..0],
  27 *                      MAGNITUDE[7..0] = LSB[7..0].
  28 *                      SIGN==0 for negative input, SIGN==1 for positive input.
  29 *                      Note: when read a second time after conversion
  30 *                            complete, MSB[7] is an "over-range" bit.
  31 */
  32#define DAS08_AI_LSB_REG        0x00    /* (R) AI least significant bits */
  33#define DAS08_AI_MSB_REG        0x01    /* (R) AI most significant bits */
  34#define DAS08_AI_TRIG_REG       0x01    /* (W) AI software trigger */
  35#define DAS08_STATUS_REG        0x02    /* (R) status */
  36#define DAS08_STATUS_AI_BUSY    BIT(7)  /* AI conversion in progress */
  37/*
  38 * The IRQ status bit is set to 1 by a rising edge on the external interrupt
  39 * input (which may be jumpered to the pacer output).  It is cleared by
  40 * setting the INTE control bit to 0.  Not present on "JR" boards.
  41 */
  42#define DAS08_STATUS_IRQ        BIT(3)  /* latched interrupt input */
  43/* digital inputs (not "JR" boards) */
  44#define DAS08_STATUS_DI(x)      (((x) & 0x70) >> 4)
  45#define DAS08_CONTROL_REG       0x02    /* (W) control */
  46/*
  47 * Note: The AI multiplexor channel can also be read from status register using
  48 * the same mask.
  49 */
  50#define DAS08_CONTROL_MUX_MASK  0x7     /* multiplexor channel mask */
  51#define DAS08_CONTROL_MUX(x)    ((x) & DAS08_CONTROL_MUX_MASK) /* mux channel */
  52#define DAS08_CONTROL_INTE      BIT(3)  /* interrupt enable (not "JR" boards) */
  53#define DAS08_CONTROL_DO_MASK   0xf0    /* digital outputs mask (not "JR") */
  54/* digital outputs (not "JR" boards) */
  55#define DAS08_CONTROL_DO(x)     (((x) << 4) & DAS08_CONTROL_DO_MASK)
  56/*
  57 * (R/W) programmable AI gain ("PGx" and "AOx" boards):
  58 * + bits 3..0 (R/W) show/set the gain for the current AI mux channel
  59 * + bits 6..4 (R) show the current AI mux channel
  60 * + bit 7 (R) not unused
  61 */
  62#define DAS08_GAIN_REG          0x03
  63
  64#define DAS08JR_DI_REG          0x03    /* (R) digital inputs ("JR" boards) */
  65#define DAS08JR_DO_REG          0x03    /* (W) digital outputs ("JR" boards) */
  66/* (W) analog output l.s.b. registers for 2 channels ("JR" boards) */
  67#define DAS08JR_AO_LSB_REG(x)   ((x) ? 0x06 : 0x04)
  68/* (W) analog output m.s.b. registers for 2 channels ("JR" boards) */
  69#define DAS08JR_AO_MSB_REG(x)   ((x) ? 0x07 : 0x05)
  70/*
  71 * (R) update analog outputs ("JR" boards set for simultaneous output)
  72 *     (same register as digital inputs)
  73 */
  74#define DAS08JR_AO_UPDATE_REG   0x03
  75
  76/* (W) analog output l.s.b. registers for 2 channels ("AOx" boards) */
  77#define DAS08AOX_AO_LSB_REG(x)  ((x) ? 0x0a : 0x08)
  78/* (W) analog output m.s.b. registers for 2 channels ("AOx" boards) */
  79#define DAS08AOX_AO_MSB_REG(x)  ((x) ? 0x0b : 0x09)
  80/*
  81 * (R) update analog outputs ("AOx" boards set for simultaneous output)
  82 *     (any of the analog output registers could be used for this)
  83 */
  84#define DAS08AOX_AO_UPDATE_REG  0x08
  85
  86/* gainlist same as _pgx_ below */
  87
  88static const struct comedi_lrange das08_pgl_ai_range = {
  89        9, {
  90                BIP_RANGE(10),
  91                BIP_RANGE(5),
  92                BIP_RANGE(2.5),
  93                BIP_RANGE(1.25),
  94                BIP_RANGE(0.625),
  95                UNI_RANGE(10),
  96                UNI_RANGE(5),
  97                UNI_RANGE(2.5),
  98                UNI_RANGE(1.25)
  99        }
 100};
 101
 102static const struct comedi_lrange das08_pgh_ai_range = {
 103        12, {
 104                BIP_RANGE(10),
 105                BIP_RANGE(5),
 106                BIP_RANGE(1),
 107                BIP_RANGE(0.5),
 108                BIP_RANGE(0.1),
 109                BIP_RANGE(0.05),
 110                BIP_RANGE(0.01),
 111                BIP_RANGE(0.005),
 112                UNI_RANGE(10),
 113                UNI_RANGE(1),
 114                UNI_RANGE(0.1),
 115                UNI_RANGE(0.01)
 116        }
 117};
 118
 119static const struct comedi_lrange das08_pgm_ai_range = {
 120        9, {
 121                BIP_RANGE(10),
 122                BIP_RANGE(5),
 123                BIP_RANGE(0.5),
 124                BIP_RANGE(0.05),
 125                BIP_RANGE(0.01),
 126                UNI_RANGE(10),
 127                UNI_RANGE(1),
 128                UNI_RANGE(0.1),
 129                UNI_RANGE(0.01)
 130        }
 131};
 132
 133static const struct comedi_lrange *const das08_ai_lranges[] = {
 134        [das08_pg_none]         = &range_unknown,
 135        [das08_bipolar5]        = &range_bipolar5,
 136        [das08_pgh]             = &das08_pgh_ai_range,
 137        [das08_pgl]             = &das08_pgl_ai_range,
 138        [das08_pgm]             = &das08_pgm_ai_range,
 139};
 140
 141static const int das08_pgh_ai_gainlist[] = {
 142        8, 0, 10, 2, 12, 4, 14, 6, 1, 3, 5, 7
 143};
 144static const int das08_pgl_ai_gainlist[] = { 8, 0, 2, 4, 6, 1, 3, 5, 7 };
 145static const int das08_pgm_ai_gainlist[] = { 8, 0, 10, 12, 14, 9, 11, 13, 15 };
 146
 147static const int *const das08_ai_gainlists[] = {
 148        [das08_pg_none]         = NULL,
 149        [das08_bipolar5]        = NULL,
 150        [das08_pgh]             = das08_pgh_ai_gainlist,
 151        [das08_pgl]             = das08_pgl_ai_gainlist,
 152        [das08_pgm]             = das08_pgm_ai_gainlist,
 153};
 154
 155static int das08_ai_eoc(struct comedi_device *dev,
 156                        struct comedi_subdevice *s,
 157                        struct comedi_insn *insn,
 158                        unsigned long context)
 159{
 160        unsigned int status;
 161
 162        status = inb(dev->iobase + DAS08_STATUS_REG);
 163        if ((status & DAS08_STATUS_AI_BUSY) == 0)
 164                return 0;
 165        return -EBUSY;
 166}
 167
 168static int das08_ai_insn_read(struct comedi_device *dev,
 169                              struct comedi_subdevice *s,
 170                              struct comedi_insn *insn, unsigned int *data)
 171{
 172        const struct das08_board_struct *board = dev->board_ptr;
 173        struct das08_private_struct *devpriv = dev->private;
 174        int n;
 175        int chan;
 176        int range;
 177        int lsb, msb;
 178        int ret;
 179
 180        chan = CR_CHAN(insn->chanspec);
 181        range = CR_RANGE(insn->chanspec);
 182
 183        /* clear crap */
 184        inb(dev->iobase + DAS08_AI_LSB_REG);
 185        inb(dev->iobase + DAS08_AI_MSB_REG);
 186
 187        /* set multiplexer */
 188        /* lock to prevent race with digital output */
 189        spin_lock(&dev->spinlock);
 190        devpriv->do_mux_bits &= ~DAS08_CONTROL_MUX_MASK;
 191        devpriv->do_mux_bits |= DAS08_CONTROL_MUX(chan);
 192        outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
 193        spin_unlock(&dev->spinlock);
 194
 195        if (devpriv->pg_gainlist) {
 196                /* set gain/range */
 197                range = CR_RANGE(insn->chanspec);
 198                outb(devpriv->pg_gainlist[range],
 199                     dev->iobase + DAS08_GAIN_REG);
 200        }
 201
 202        for (n = 0; n < insn->n; n++) {
 203                /* clear over-range bits for 16-bit boards */
 204                if (board->ai_nbits == 16)
 205                        if (inb(dev->iobase + DAS08_AI_MSB_REG) & 0x80)
 206                                dev_info(dev->class_dev, "over-range\n");
 207
 208                /* trigger conversion */
 209                outb_p(0, dev->iobase + DAS08_AI_TRIG_REG);
 210
 211                ret = comedi_timeout(dev, s, insn, das08_ai_eoc, 0);
 212                if (ret)
 213                        return ret;
 214
 215                msb = inb(dev->iobase + DAS08_AI_MSB_REG);
 216                lsb = inb(dev->iobase + DAS08_AI_LSB_REG);
 217                if (board->ai_encoding == das08_encode12) {
 218                        data[n] = (lsb >> 4) | (msb << 4);
 219                } else if (board->ai_encoding == das08_pcm_encode12) {
 220                        data[n] = (msb << 8) + lsb;
 221                } else if (board->ai_encoding == das08_encode16) {
 222                        /*
 223                         * "JR" 16-bit boards are sign-magnitude.
 224                         *
 225                         * XXX The manual seems to imply that 0 is full-scale
 226                         * negative and 65535 is full-scale positive, but the
 227                         * original COMEDI patch to add support for the
 228                         * DAS08/JR/16 and DAS08/JR/16-AO boards have it
 229                         * encoded as sign-magnitude.  Assume the original
 230                         * COMEDI code is correct for now.
 231                         */
 232                        unsigned int magnitude = lsb | ((msb & 0x7f) << 8);
 233
 234                        /*
 235                         * MSB bit 7 is 0 for negative, 1 for positive voltage.
 236                         * COMEDI 16-bit bipolar data value for 0V is 0x8000.
 237                         */
 238                        if (msb & 0x80)
 239                                data[n] = BIT(15) + magnitude;
 240                        else
 241                                data[n] = BIT(15) - magnitude;
 242                } else {
 243                        dev_err(dev->class_dev, "bug! unknown ai encoding\n");
 244                        return -1;
 245                }
 246        }
 247
 248        return n;
 249}
 250
 251static int das08_di_insn_bits(struct comedi_device *dev,
 252                              struct comedi_subdevice *s,
 253                              struct comedi_insn *insn, unsigned int *data)
 254{
 255        data[0] = 0;
 256        data[1] = DAS08_STATUS_DI(inb(dev->iobase + DAS08_STATUS_REG));
 257
 258        return insn->n;
 259}
 260
 261static int das08_do_insn_bits(struct comedi_device *dev,
 262                              struct comedi_subdevice *s,
 263                              struct comedi_insn *insn, unsigned int *data)
 264{
 265        struct das08_private_struct *devpriv = dev->private;
 266
 267        if (comedi_dio_update_state(s, data)) {
 268                /* prevent race with setting of analog input mux */
 269                spin_lock(&dev->spinlock);
 270                devpriv->do_mux_bits &= ~DAS08_CONTROL_DO_MASK;
 271                devpriv->do_mux_bits |= DAS08_CONTROL_DO(s->state);
 272                outb(devpriv->do_mux_bits, dev->iobase + DAS08_CONTROL_REG);
 273                spin_unlock(&dev->spinlock);
 274        }
 275
 276        data[1] = s->state;
 277
 278        return insn->n;
 279}
 280
 281static int das08jr_di_insn_bits(struct comedi_device *dev,
 282                                struct comedi_subdevice *s,
 283                                struct comedi_insn *insn, unsigned int *data)
 284{
 285        data[0] = 0;
 286        data[1] = inb(dev->iobase + DAS08JR_DI_REG);
 287
 288        return insn->n;
 289}
 290
 291static int das08jr_do_insn_bits(struct comedi_device *dev,
 292                                struct comedi_subdevice *s,
 293                                struct comedi_insn *insn, unsigned int *data)
 294{
 295        if (comedi_dio_update_state(s, data))
 296                outb(s->state, dev->iobase + DAS08JR_DO_REG);
 297
 298        data[1] = s->state;
 299
 300        return insn->n;
 301}
 302
 303static void das08_ao_set_data(struct comedi_device *dev,
 304                              unsigned int chan, unsigned int data)
 305{
 306        const struct das08_board_struct *board = dev->board_ptr;
 307        unsigned char lsb;
 308        unsigned char msb;
 309
 310        lsb = data & 0xff;
 311        msb = (data >> 8) & 0xff;
 312        if (board->is_jr) {
 313                outb(lsb, dev->iobase + DAS08JR_AO_LSB_REG(chan));
 314                outb(msb, dev->iobase + DAS08JR_AO_MSB_REG(chan));
 315                /* load DACs */
 316                inb(dev->iobase + DAS08JR_AO_UPDATE_REG);
 317        } else {
 318                outb(lsb, dev->iobase + DAS08AOX_AO_LSB_REG(chan));
 319                outb(msb, dev->iobase + DAS08AOX_AO_MSB_REG(chan));
 320                /* load DACs */
 321                inb(dev->iobase + DAS08AOX_AO_UPDATE_REG);
 322        }
 323}
 324
 325static int das08_ao_insn_write(struct comedi_device *dev,
 326                               struct comedi_subdevice *s,
 327                               struct comedi_insn *insn,
 328                               unsigned int *data)
 329{
 330        unsigned int chan = CR_CHAN(insn->chanspec);
 331        unsigned int val = s->readback[chan];
 332        int i;
 333
 334        for (i = 0; i < insn->n; i++) {
 335                val = data[i];
 336                das08_ao_set_data(dev, chan, val);
 337        }
 338        s->readback[chan] = val;
 339
 340        return insn->n;
 341}
 342
 343int das08_common_attach(struct comedi_device *dev, unsigned long iobase)
 344{
 345        const struct das08_board_struct *board = dev->board_ptr;
 346        struct das08_private_struct *devpriv = dev->private;
 347        struct comedi_subdevice *s;
 348        int ret;
 349        int i;
 350
 351        dev->iobase = iobase;
 352
 353        dev->board_name = board->name;
 354
 355        ret = comedi_alloc_subdevices(dev, 6);
 356        if (ret)
 357                return ret;
 358
 359        s = &dev->subdevices[0];
 360        /* ai */
 361        if (board->ai_nbits) {
 362                s->type = COMEDI_SUBD_AI;
 363                /*
 364                 * XXX some boards actually have differential
 365                 * inputs instead of single ended.
 366                 * The driver does nothing with arefs though,
 367                 * so it's no big deal.
 368                 */
 369                s->subdev_flags = SDF_READABLE | SDF_GROUND;
 370                s->n_chan = 8;
 371                s->maxdata = (1 << board->ai_nbits) - 1;
 372                s->range_table = das08_ai_lranges[board->ai_pg];
 373                s->insn_read = das08_ai_insn_read;
 374                devpriv->pg_gainlist = das08_ai_gainlists[board->ai_pg];
 375        } else {
 376                s->type = COMEDI_SUBD_UNUSED;
 377        }
 378
 379        s = &dev->subdevices[1];
 380        /* ao */
 381        if (board->ao_nbits) {
 382                s->type = COMEDI_SUBD_AO;
 383                s->subdev_flags = SDF_WRITABLE;
 384                s->n_chan = 2;
 385                s->maxdata = (1 << board->ao_nbits) - 1;
 386                s->range_table = &range_bipolar5;
 387                s->insn_write = das08_ao_insn_write;
 388
 389                ret = comedi_alloc_subdev_readback(s);
 390                if (ret)
 391                        return ret;
 392
 393                /* initialize all channels to 0V */
 394                for (i = 0; i < s->n_chan; i++) {
 395                        s->readback[i] = s->maxdata / 2;
 396                        das08_ao_set_data(dev, i, s->readback[i]);
 397                }
 398        } else {
 399                s->type = COMEDI_SUBD_UNUSED;
 400        }
 401
 402        s = &dev->subdevices[2];
 403        /* di */
 404        if (board->di_nchan) {
 405                s->type = COMEDI_SUBD_DI;
 406                s->subdev_flags = SDF_READABLE;
 407                s->n_chan = board->di_nchan;
 408                s->maxdata = 1;
 409                s->range_table = &range_digital;
 410                s->insn_bits = board->is_jr ? das08jr_di_insn_bits :
 411                               das08_di_insn_bits;
 412        } else {
 413                s->type = COMEDI_SUBD_UNUSED;
 414        }
 415
 416        s = &dev->subdevices[3];
 417        /* do */
 418        if (board->do_nchan) {
 419                s->type = COMEDI_SUBD_DO;
 420                s->subdev_flags = SDF_WRITABLE;
 421                s->n_chan = board->do_nchan;
 422                s->maxdata = 1;
 423                s->range_table = &range_digital;
 424                s->insn_bits = board->is_jr ? das08jr_do_insn_bits :
 425                               das08_do_insn_bits;
 426        } else {
 427                s->type = COMEDI_SUBD_UNUSED;
 428        }
 429
 430        s = &dev->subdevices[4];
 431        /* 8255 */
 432        if (board->i8255_offset != 0) {
 433                ret = subdev_8255_init(dev, s, NULL, board->i8255_offset);
 434                if (ret)
 435                        return ret;
 436        } else {
 437                s->type = COMEDI_SUBD_UNUSED;
 438        }
 439
 440        /* Counter subdevice (8254) */
 441        s = &dev->subdevices[5];
 442        if (board->i8254_offset) {
 443                dev->pacer = comedi_8254_init(dev->iobase + board->i8254_offset,
 444                                              0, I8254_IO8, 0);
 445                if (!dev->pacer)
 446                        return -ENOMEM;
 447
 448                comedi_8254_subdevice_init(s, dev->pacer);
 449        } else {
 450                s->type = COMEDI_SUBD_UNUSED;
 451        }
 452
 453        return 0;
 454}
 455EXPORT_SYMBOL_GPL(das08_common_attach);
 456
 457static int __init das08_init(void)
 458{
 459        return 0;
 460}
 461module_init(das08_init);
 462
 463static void __exit das08_exit(void)
 464{
 465}
 466module_exit(das08_exit);
 467
 468MODULE_AUTHOR("Comedi https://www.comedi.org");
 469MODULE_DESCRIPTION("Comedi common DAS08 support module");
 470MODULE_LICENSE("GPL");
 471