drivers/staging/comedi/drivers/das08.c

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This source file includes following definitions.
das08_ai_eoc
das08_ai_insn_read
das08_di_insn_bits
das08_do_insn_bits
das08jr_di_insn_bits
das08jr_do_insn_bits
das08_ao_set_data
das08_ao_insn_write
das08_common_attach
das08_init
das08_exit
   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 
  88 static 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 
 102 static 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 
 119 static 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 
 133 static 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 
 141 static const int das08_pgh_ai_gainlist[] = {
 142         8, 0, 10, 2, 12, 4, 14, 6, 1, 3, 5, 7
 143 };
 144 static const int das08_pgl_ai_gainlist[] = { 8, 0, 2, 4, 6, 1, 3, 5, 7 };
 145 static const int das08_pgm_ai_gainlist[] = { 8, 0, 10, 12, 14, 9, 11, 13, 15 };
 146 
 147 static 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 
 155 static 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 
 168 static 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 
 251 static 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 
 261 static 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 
 281 static 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 
 291 static 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 
 303 static 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 
 325 static 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 
 343 int 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 }
 455 EXPORT_SYMBOL_GPL(das08_common_attach);
 456 
 457 static int __init das08_init(void)
 458 {
 459         return 0;
 460 }
 461 module_init(das08_init);
 462 
 463 static void __exit das08_exit(void)
 464 {
 465 }
 466 module_exit(das08_exit);
 467 
 468 MODULE_AUTHOR("Comedi http://www.comedi.org");
 469 MODULE_DESCRIPTION("Comedi common DAS08 support module");
 470 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/staging/comedi/drivers/das08.c

DEFINITIONS
