drivers/staging/comedi/comedi.h

   1 /*
   2     include/comedi.h (installed as /usr/include/comedi.h)
   3     header file for comedi
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 1998-2001 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 Lesser 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 #ifndef _COMEDI_H
  25 #define _COMEDI_H
  26
  27 #define COMEDI_MAJORVERSION     0
  28 #define COMEDI_MINORVERSION     7
  29 #define COMEDI_MICROVERSION     76
  30 #define VERSION "0.7.76"
  31
  32 /* comedi's major device number */
  33 #define COMEDI_MAJOR 98
  34
  35 /*
  36    maximum number of minor devices.  This can be increased, although
  37    kernel structures are currently statically allocated, thus you
  38    don't want this to be much more than you actually use.
  39  */
  40 #define COMEDI_NDEVICES 16
  41
  42 /* number of config options in the config structure */
  43 #define COMEDI_NDEVCONFOPTS 32
  44 /*length of nth chunk of firmware data*/
  45 #define COMEDI_DEVCONF_AUX_DATA3_LENGTH         25
  46 #define COMEDI_DEVCONF_AUX_DATA2_LENGTH         26
  47 #define COMEDI_DEVCONF_AUX_DATA1_LENGTH         27
  48 #define COMEDI_DEVCONF_AUX_DATA0_LENGTH         28
  49 /* most significant 32 bits of pointer address (if needed) */
  50 #define COMEDI_DEVCONF_AUX_DATA_HI              29
  51 /* least significant 32 bits of pointer address */
  52 #define COMEDI_DEVCONF_AUX_DATA_LO              30
  53 #define COMEDI_DEVCONF_AUX_DATA_LENGTH          31      /* total data length */
  54
  55 /* max length of device and driver names */
  56 #define COMEDI_NAMELEN 20
  57
  58 /* packs and unpacks a channel/range number */
  59
  60 #define CR_PACK(chan, rng, aref)                                        \
  61         ((((aref)&0x3)<<24) | (((rng)&0xff)<<16) | (chan))
  62 #define CR_PACK_FLAGS(chan, range, aref, flags)                         \
  63         (CR_PACK(chan, range, aref) | ((flags) & CR_FLAGS_MASK))
  64
  65 #define CR_CHAN(a)      ((a)&0xffff)
  66 #define CR_RANGE(a)     (((a)>>16)&0xff)
  67 #define CR_AREF(a)      (((a)>>24)&0x03)
  68
  69 #define CR_FLAGS_MASK   0xfc000000
  70 #define CR_ALT_FILTER   (1<<26)
  71 #define CR_DITHER       CR_ALT_FILTER
  72 #define CR_DEGLITCH     CR_ALT_FILTER
  73 #define CR_ALT_SOURCE   (1<<27)
  74 #define CR_EDGE         (1<<30)
  75 #define CR_INVERT       (1<<31)
  76
  77 #define AREF_GROUND     0x00    /* analog ref = analog ground */
  78 #define AREF_COMMON     0x01    /* analog ref = analog common */
  79 #define AREF_DIFF       0x02    /* analog ref = differential */
  80 #define AREF_OTHER      0x03    /* analog ref = other (undefined) */
  81
  82 /* counters -- these are arbitrary values */
  83 #define GPCT_RESET              0x0001
  84 #define GPCT_SET_SOURCE         0x0002
  85 #define GPCT_SET_GATE           0x0004
  86 #define GPCT_SET_DIRECTION      0x0008
  87 #define GPCT_SET_OPERATION      0x0010
  88 #define GPCT_ARM                0x0020
  89 #define GPCT_DISARM             0x0040
  90 #define GPCT_GET_INT_CLK_FRQ    0x0080
  91
  92 #define GPCT_INT_CLOCK          0x0001
  93 #define GPCT_EXT_PIN            0x0002
  94 #define GPCT_NO_GATE            0x0004
  95 #define GPCT_UP                 0x0008
  96 #define GPCT_DOWN               0x0010
  97 #define GPCT_HWUD               0x0020
  98 #define GPCT_SIMPLE_EVENT       0x0040
  99 #define GPCT_SINGLE_PERIOD      0x0080
 100 #define GPCT_SINGLE_PW          0x0100
 101 #define GPCT_CONT_PULSE_OUT     0x0200
 102 #define GPCT_SINGLE_PULSE_OUT   0x0400
 103
 104 /* instructions */
 105
 106 #define INSN_MASK_WRITE         0x8000000
 107 #define INSN_MASK_READ          0x4000000
 108 #define INSN_MASK_SPECIAL       0x2000000
 109
 110 #define INSN_READ               (0 | INSN_MASK_READ)
 111 #define INSN_WRITE              (1 | INSN_MASK_WRITE)
 112 #define INSN_BITS               (2 | INSN_MASK_READ|INSN_MASK_WRITE)
 113 #define INSN_CONFIG             (3 | INSN_MASK_READ|INSN_MASK_WRITE)
 114 #define INSN_GTOD               (4 | INSN_MASK_READ|INSN_MASK_SPECIAL)
 115 #define INSN_WAIT               (5 | INSN_MASK_WRITE|INSN_MASK_SPECIAL)
 116 #define INSN_INTTRIG            (6 | INSN_MASK_WRITE|INSN_MASK_SPECIAL)
 117
 118 /* trigger flags */
 119 /* These flags are used in comedi_trig structures */
 120
 121 #define TRIG_BOGUS      0x0001  /* do the motions */
 122 #define TRIG_DITHER     0x0002  /* enable dithering */
 123 #define TRIG_DEGLITCH   0x0004  /* enable deglitching */
 124         /*#define TRIG_RT       0x0008 *//* perform op in real time */
 125 #define TRIG_CONFIG     0x0010  /* perform configuration, not triggering */
 126 #define TRIG_WAKE_EOS   0x0020  /* wake up on end-of-scan events */
 127         /*#define TRIG_WRITE    0x0040*//* write to bidirectional devices */
 128
 129 /* command flags */
 130 /* These flags are used in comedi_cmd structures */
 131
 132 /* try to use a real-time interrupt while performing command */
 133 #define CMDF_PRIORITY           0x00000008
 134
 135 #define TRIG_RT         CMDF_PRIORITY   /* compatibility definition */
 136
 137 #define CMDF_WRITE              0x00000040
 138 #define TRIG_WRITE      CMDF_WRITE      /* compatibility definition */
 139
 140 #define CMDF_RAWDATA            0x00000080
 141
 142 #define COMEDI_EV_START         0x00040000
 143 #define COMEDI_EV_SCAN_BEGIN    0x00080000
 144 #define COMEDI_EV_CONVERT       0x00100000
 145 #define COMEDI_EV_SCAN_END      0x00200000
 146 #define COMEDI_EV_STOP          0x00400000
 147
 148 #define TRIG_ROUND_MASK         0x00030000
 149 #define TRIG_ROUND_NEAREST      0x00000000
 150 #define TRIG_ROUND_DOWN         0x00010000
 151 #define TRIG_ROUND_UP           0x00020000
 152 #define TRIG_ROUND_UP_NEXT      0x00030000
 153
 154 /* trigger sources */
 155
 156 #define TRIG_ANY        0xffffffff
 157 #define TRIG_INVALID    0x00000000
 158
 159 #define TRIG_NONE       0x00000001 /* never trigger */
 160 #define TRIG_NOW        0x00000002 /* trigger now + N ns */
 161 #define TRIG_FOLLOW     0x00000004 /* trigger on next lower level trig */
 162 #define TRIG_TIME       0x00000008 /* trigger at time N ns */
 163 #define TRIG_TIMER      0x00000010 /* trigger at rate N ns */
 164 #define TRIG_COUNT      0x00000020 /* trigger when count reaches N */
 165 #define TRIG_EXT        0x00000040 /* trigger on external signal N */
 166 #define TRIG_INT        0x00000080 /* trigger on comedi-internal signal N */
 167 #define TRIG_OTHER      0x00000100 /* driver defined */
 168
 169 /* subdevice flags */
 170
 171 #define SDF_BUSY        0x0001  /* device is busy */
 172 #define SDF_BUSY_OWNER  0x0002  /* device is busy with your job */
 173 #define SDF_LOCKED      0x0004  /* subdevice is locked */
 174 #define SDF_LOCK_OWNER  0x0008  /* you own lock */
 175 #define SDF_MAXDATA     0x0010  /* maxdata depends on channel */
 176 #define SDF_FLAGS       0x0020  /* flags depend on channel */
 177 #define SDF_RANGETYPE   0x0040  /* range type depends on channel */
 178 #define SDF_MODE0       0x0080  /* can do mode 0 */
 179 #define SDF_MODE1       0x0100  /* can do mode 1 */
 180 #define SDF_MODE2       0x0200  /* can do mode 2 */
 181 #define SDF_MODE3       0x0400  /* can do mode 3 */
 182 #define SDF_MODE4       0x0800  /* can do mode 4 */
 183 #define SDF_CMD         0x1000  /* can do commands (deprecated) */
 184 #define SDF_SOFT_CALIBRATED     0x2000 /* subdevice uses software calibration */
 185 #define SDF_CMD_WRITE           0x4000 /* can do output commands */
 186 #define SDF_CMD_READ            0x8000 /* can do input commands */
 187
 188 /* subdevice can be read (e.g. analog input) */
 189 #define SDF_READABLE    0x00010000
 190 /* subdevice can be written (e.g. analog output) */
 191 #define SDF_WRITABLE    0x00020000
 192 #define SDF_WRITEABLE   SDF_WRITABLE    /* spelling error in API */
 193 /* subdevice does not have externally visible lines */
 194 #define SDF_INTERNAL    0x00040000
 195 #define SDF_GROUND      0x00100000      /* can do aref=ground */
 196 #define SDF_COMMON      0x00200000      /* can do aref=common */
 197 #define SDF_DIFF        0x00400000      /* can do aref=diff */
 198 #define SDF_OTHER       0x00800000      /* can do aref=other */
 199 #define SDF_DITHER      0x01000000      /* can do dithering */
 200 #define SDF_DEGLITCH    0x02000000      /* can do deglitching */
 201 #define SDF_MMAP        0x04000000      /* can do mmap() */
 202 #define SDF_RUNNING     0x08000000      /* subdevice is acquiring data */
 203 #define SDF_LSAMPL      0x10000000      /* subdevice uses 32-bit samples */
 204 #define SDF_PACKED      0x20000000      /* subdevice can do packed DIO */
 205 /* re recyle these flags for PWM */
 206 #define SDF_PWM_COUNTER SDF_MODE0       /* PWM can automatically switch off */
 207 #define SDF_PWM_HBRIDGE SDF_MODE1       /* PWM is signed (H-bridge) */
 208
 209 /* subdevice types */
 210
 211         enum comedi_subdevice_type {
 212                 COMEDI_SUBD_UNUSED,     /* unused by driver */
 213                 COMEDI_SUBD_AI, /* analog input */
 214                 COMEDI_SUBD_AO, /* analog output */
 215                 COMEDI_SUBD_DI, /* digital input */
 216                 COMEDI_SUBD_DO, /* digital output */
 217                 COMEDI_SUBD_DIO,        /* digital input/output */
 218                 COMEDI_SUBD_COUNTER,    /* counter */
 219                 COMEDI_SUBD_TIMER,      /* timer */
 220                 COMEDI_SUBD_MEMORY,     /* memory, EEPROM, DPRAM */
 221                 COMEDI_SUBD_CALIB,      /* calibration DACs */
 222                 COMEDI_SUBD_PROC,       /* processor, DSP */
 223                 COMEDI_SUBD_SERIAL,     /* serial IO */
 224                 COMEDI_SUBD_PWM /* PWM */
 225         };
 226
 227 /* configuration instructions */
 228
 229         enum configuration_ids {
 230                 INSN_CONFIG_DIO_INPUT = 0,
 231                 INSN_CONFIG_DIO_OUTPUT = 1,
 232                 INSN_CONFIG_DIO_OPENDRAIN = 2,
 233                 INSN_CONFIG_ANALOG_TRIG = 16,
 234 /*      INSN_CONFIG_WAVEFORM = 17, */
 235 /*      INSN_CONFIG_TRIG = 18, */
 236 /*      INSN_CONFIG_COUNTER = 19, */
 237                 INSN_CONFIG_ALT_SOURCE = 20,
 238                 INSN_CONFIG_DIGITAL_TRIG = 21,
 239                 INSN_CONFIG_BLOCK_SIZE = 22,
 240                 INSN_CONFIG_TIMER_1 = 23,
 241                 INSN_CONFIG_FILTER = 24,
 242                 INSN_CONFIG_CHANGE_NOTIFY = 25,
 243
 244                  /*ALPHA*/ INSN_CONFIG_SERIAL_CLOCK = 26,
 245                 INSN_CONFIG_BIDIRECTIONAL_DATA = 27,
 246                 INSN_CONFIG_DIO_QUERY = 28,
 247                 INSN_CONFIG_PWM_OUTPUT = 29,
 248                 INSN_CONFIG_GET_PWM_OUTPUT = 30,
 249                 INSN_CONFIG_ARM = 31,
 250                 INSN_CONFIG_DISARM = 32,
 251                 INSN_CONFIG_GET_COUNTER_STATUS = 33,
 252                 INSN_CONFIG_RESET = 34,
 253                 /* Use CTR as single pulsegenerator */
 254                 INSN_CONFIG_GPCT_SINGLE_PULSE_GENERATOR = 1001,
 255                 /* Use CTR as pulsetraingenerator */
 256                 INSN_CONFIG_GPCT_PULSE_TRAIN_GENERATOR = 1002,
 257                 /* Use the counter as encoder */
 258                 INSN_CONFIG_GPCT_QUADRATURE_ENCODER = 1003,
 259                 INSN_CONFIG_SET_GATE_SRC = 2001,        /* Set gate source */
 260                 INSN_CONFIG_GET_GATE_SRC = 2002,        /* Get gate source */
 261                 /* Set master clock source */
 262                 INSN_CONFIG_SET_CLOCK_SRC = 2003,
 263                 INSN_CONFIG_GET_CLOCK_SRC = 2004, /* Get master clock source */
 264                 INSN_CONFIG_SET_OTHER_SRC = 2005, /* Set other source */
 265                 /* INSN_CONFIG_GET_OTHER_SRC = 2006,*//* Get other source */
 266                 /* Get size in bytes of subdevice's on-board fifos used during
 267                  * streaming input/output */
 268                 INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE = 2006,
 269                 INSN_CONFIG_SET_COUNTER_MODE = 4097,
 270                 /* INSN_CONFIG_8254_SET_MODE is deprecated */
 271                 INSN_CONFIG_8254_SET_MODE = INSN_CONFIG_SET_COUNTER_MODE,
 272                 INSN_CONFIG_8254_READ_STATUS = 4098,
 273                 INSN_CONFIG_SET_ROUTING = 4099,
 274                 INSN_CONFIG_GET_ROUTING = 4109,
 275 /* PWM */
 276                 INSN_CONFIG_PWM_SET_PERIOD = 5000,      /* sets frequency */
 277                 INSN_CONFIG_PWM_GET_PERIOD = 5001,      /* gets frequency */
 278                 INSN_CONFIG_GET_PWM_STATUS = 5002,      /* is it running? */
 279                 /* sets H bridge: duty cycle and sign bit for a relay at the
 280                  * same time */
 281                 INSN_CONFIG_PWM_SET_H_BRIDGE = 5003,
 282                 /* gets H bridge data: duty cycle and the sign bit */
 283                 INSN_CONFIG_PWM_GET_H_BRIDGE = 5004
 284         };
 285
 286         enum comedi_io_direction {
 287                 COMEDI_INPUT = 0,
 288                 COMEDI_OUTPUT = 1,
 289                 COMEDI_OPENDRAIN = 2
 290         };
 291
 292         enum comedi_support_level {
 293                 COMEDI_UNKNOWN_SUPPORT = 0,
 294                 COMEDI_SUPPORTED,
 295                 COMEDI_UNSUPPORTED
 296         };
 297
 298 /* ioctls */
 299
 300 #define CIO 'd'
 301 #define COMEDI_DEVCONFIG _IOW(CIO, 0, struct comedi_devconfig)
 302 #define COMEDI_DEVINFO _IOR(CIO, 1, struct comedi_devinfo)
 303 #define COMEDI_SUBDINFO _IOR(CIO, 2, struct comedi_subdinfo)
 304 #define COMEDI_CHANINFO _IOR(CIO, 3, struct comedi_chaninfo)
 305 #define COMEDI_TRIG _IOWR(CIO, 4, comedi_trig)
 306 #define COMEDI_LOCK _IO(CIO, 5)
 307 #define COMEDI_UNLOCK _IO(CIO, 6)
 308 #define COMEDI_CANCEL _IO(CIO, 7)
 309 #define COMEDI_RANGEINFO _IOR(CIO, 8, struct comedi_rangeinfo)
 310 #define COMEDI_CMD _IOR(CIO, 9, struct comedi_cmd)
 311 #define COMEDI_CMDTEST _IOR(CIO, 10, struct comedi_cmd)
 312 #define COMEDI_INSNLIST _IOR(CIO, 11, struct comedi_insnlist)
 313 #define COMEDI_INSN _IOR(CIO, 12, struct comedi_insn)
 314 #define COMEDI_BUFCONFIG _IOR(CIO, 13, struct comedi_bufconfig)
 315 #define COMEDI_BUFINFO _IOWR(CIO, 14, struct comedi_bufinfo)
 316 #define COMEDI_POLL _IO(CIO, 15)
 317
 318 /* structures */
 319
 320         struct comedi_trig {
 321                 unsigned int subdev;    /* subdevice */
 322                 unsigned int mode;      /* mode */
 323                 unsigned int flags;
 324                 unsigned int n_chan;    /* number of channels */
 325                 unsigned int *chanlist; /* channel/range list */
 326                 short *data;    /* data list, size depends on subd flags */
 327                 unsigned int n; /* number of scans */
 328                 unsigned int trigsrc;
 329                 unsigned int trigvar;
 330                 unsigned int trigvar1;
 331                 unsigned int data_len;
 332                 unsigned int unused[3];
 333         };
 334
 335         struct comedi_insn {
 336                 unsigned int insn;
 337                 unsigned int n;
 338                 unsigned int __user *data;
 339                 unsigned int subdev;
 340                 unsigned int chanspec;
 341                 unsigned int unused[3];
 342         };
 343
 344         struct comedi_insnlist {
 345                 unsigned int n_insns;
 346                 struct comedi_insn __user *insns;
 347         };
 348
 349         struct comedi_cmd {
 350                 unsigned int subdev;
 351                 unsigned int flags;
 352
 353                 unsigned int start_src;
 354                 unsigned int start_arg;
 355
 356                 unsigned int scan_begin_src;
 357                 unsigned int scan_begin_arg;
 358
 359                 unsigned int convert_src;
 360                 unsigned int convert_arg;
 361
 362                 unsigned int scan_end_src;
 363                 unsigned int scan_end_arg;
 364
 365                 unsigned int stop_src;
 366                 unsigned int stop_arg;
 367
 368                 unsigned int __user *chanlist;  /* channel/range list */
 369                 unsigned int chanlist_len;
 370
 371                 short __user *data; /* data list, size depends on subd flags */
 372                 unsigned int data_len;
 373         };
 374
 375         struct comedi_chaninfo {
 376                 unsigned int subdev;
 377                 unsigned int __user *maxdata_list;
 378                 unsigned int __user *flaglist;
 379                 unsigned int __user *rangelist;
 380                 unsigned int unused[4];
 381         };
 382
 383         struct comedi_rangeinfo {
 384                 unsigned int range_type;
 385                 void __user *range_ptr;
 386         };
 387
 388         struct comedi_krange {
 389                 int min;        /* fixed point, multiply by 1e-6 */
 390                 int max;        /* fixed point, multiply by 1e-6 */
 391                 unsigned int flags;
 392         };
 393
 394         struct comedi_subdinfo {
 395                 unsigned int type;
 396                 unsigned int n_chan;
 397                 unsigned int subd_flags;
 398                 unsigned int timer_type;
 399                 unsigned int len_chanlist;
 400                 unsigned int maxdata;
 401                 unsigned int flags;     /* channel flags */
 402                 unsigned int range_type;        /* lookup in kernel */
 403                 unsigned int settling_time_0;
 404                 /* see support_level enum for values */
 405                 unsigned insn_bits_support;
 406                 unsigned int unused[8];
 407         };
 408
 409         struct comedi_devinfo {
 410                 unsigned int version_code;
 411                 unsigned int n_subdevs;
 412                 char driver_name[COMEDI_NAMELEN];
 413                 char board_name[COMEDI_NAMELEN];
 414                 int read_subdevice;
 415                 int write_subdevice;
 416                 int unused[30];
 417         };
 418
 419         struct comedi_devconfig {
 420                 char board_name[COMEDI_NAMELEN];
 421                 int options[COMEDI_NDEVCONFOPTS];
 422         };
 423
 424         struct comedi_bufconfig {
 425                 unsigned int subdevice;
 426                 unsigned int flags;
 427
 428                 unsigned int maximum_size;
 429                 unsigned int size;
 430
 431                 unsigned int unused[4];
 432         };
 433
 434         struct comedi_bufinfo {
 435                 unsigned int subdevice;
 436                 unsigned int bytes_read;
 437
 438                 unsigned int buf_write_ptr;
 439                 unsigned int buf_read_ptr;
 440                 unsigned int buf_write_count;
 441                 unsigned int buf_read_count;
 442
 443                 unsigned int bytes_written;
 444
 445                 unsigned int unused[4];
 446         };
 447
 448 /* range stuff */
 449
 450 #define __RANGE(a, b)   ((((a)&0xffff)<<16)|((b)&0xffff))
 451
 452 #define RANGE_OFFSET(a)         (((a)>>16)&0xffff)
 453 #define RANGE_LENGTH(b)         ((b)&0xffff)
 454
 455 #define RF_UNIT(flags)          ((flags)&0xff)
 456 #define RF_EXTERNAL             (1<<8)
 457
 458 #define UNIT_volt               0
 459 #define UNIT_mA                 1
 460 #define UNIT_none               2
 461
 462 #define COMEDI_MIN_SPEED        ((unsigned int)0xffffffff)
 463
 464 /* callback stuff */
 465 /* only relevant to kernel modules. */
 466
 467 #define COMEDI_CB_EOS           1       /* end of scan */
 468 #define COMEDI_CB_EOA           2       /* end of acquisition */
 469 #define COMEDI_CB_BLOCK         4       /* data has arrived:
 470                                          * wakes up read() / write() */
 471 #define COMEDI_CB_EOBUF         8       /* DEPRECATED: end of buffer */
 472 #define COMEDI_CB_ERROR         16      /* card error during acquisition */
 473 #define COMEDI_CB_OVERFLOW      32      /* buffer overflow/underflow */
 474
 475 /**********************************************************/
 476 /* everything after this line is ALPHA */
 477 /**********************************************************/
 478
 479 /*
 480   8254 specific configuration.
 481
 482   It supports two config commands:
 483
 484   0 ID: INSN_CONFIG_SET_COUNTER_MODE
 485   1 8254 Mode
 486     I8254_MODE0, I8254_MODE1, ..., I8254_MODE5
 487     OR'ed with:
 488     I8254_BCD, I8254_BINARY
 489
 490   0 ID: INSN_CONFIG_8254_READ_STATUS
 491   1 <-- Status byte returned here.
 492     B7 = Output
 493     B6 = NULL Count
 494     B5 - B0 Current mode.
 495
 496 */
 497
 498         enum i8254_mode {
 499                 I8254_MODE0 = (0 << 1), /* Interrupt on terminal count */
 500                 I8254_MODE1 = (1 << 1), /* Hardware retriggerable one-shot */
 501                 I8254_MODE2 = (2 << 1), /* Rate generator */
 502                 I8254_MODE3 = (3 << 1), /* Square wave mode */
 503                 I8254_MODE4 = (4 << 1), /* Software triggered strobe */
 504                 I8254_MODE5 = (5 << 1), /* Hardware triggered strobe
 505                                          * (retriggerable) */
 506                 I8254_BCD = 1,  /* use binary-coded decimal instead of binary
 507                                  * (pretty useless) */
 508                 I8254_BINARY = 0
 509         };
 510
 511         static inline unsigned NI_USUAL_PFI_SELECT(unsigned pfi_channel)
 512         {
 513                 if (pfi_channel < 10)
 514                         return 0x1 + pfi_channel;
 515                 else
 516                         return 0xb + pfi_channel;
 517         }
 518
 519         static inline unsigned NI_USUAL_RTSI_SELECT(unsigned rtsi_channel)
 520         {
 521                 if (rtsi_channel < 7)
 522                         return 0xb + rtsi_channel;
 523                 else
 524                         return 0x1b;
 525         }
 526
 527 /* mode bits for NI general-purpose counters, set with
 528  * INSN_CONFIG_SET_COUNTER_MODE */
 529 #define NI_GPCT_COUNTING_MODE_SHIFT 16
 530 #define NI_GPCT_INDEX_PHASE_BITSHIFT 20
 531 #define NI_GPCT_COUNTING_DIRECTION_SHIFT 24
 532         enum ni_gpct_mode_bits {
 533                 NI_GPCT_GATE_ON_BOTH_EDGES_BIT = 0x4,
 534                 NI_GPCT_EDGE_GATE_MODE_MASK = 0x18,
 535                 NI_GPCT_EDGE_GATE_STARTS_STOPS_BITS = 0x0,
 536                 NI_GPCT_EDGE_GATE_STOPS_STARTS_BITS = 0x8,
 537                 NI_GPCT_EDGE_GATE_STARTS_BITS = 0x10,
 538                 NI_GPCT_EDGE_GATE_NO_STARTS_NO_STOPS_BITS = 0x18,
 539                 NI_GPCT_STOP_MODE_MASK = 0x60,
 540                 NI_GPCT_STOP_ON_GATE_BITS = 0x00,
 541                 NI_GPCT_STOP_ON_GATE_OR_TC_BITS = 0x20,
 542                 NI_GPCT_STOP_ON_GATE_OR_SECOND_TC_BITS = 0x40,
 543                 NI_GPCT_LOAD_B_SELECT_BIT = 0x80,
 544                 NI_GPCT_OUTPUT_MODE_MASK = 0x300,
 545                 NI_GPCT_OUTPUT_TC_PULSE_BITS = 0x100,
 546                 NI_GPCT_OUTPUT_TC_TOGGLE_BITS = 0x200,
 547                 NI_GPCT_OUTPUT_TC_OR_GATE_TOGGLE_BITS = 0x300,
 548                 NI_GPCT_HARDWARE_DISARM_MASK = 0xc00,
 549                 NI_GPCT_NO_HARDWARE_DISARM_BITS = 0x000,
 550                 NI_GPCT_DISARM_AT_TC_BITS = 0x400,
 551                 NI_GPCT_DISARM_AT_GATE_BITS = 0x800,
 552                 NI_GPCT_DISARM_AT_TC_OR_GATE_BITS = 0xc00,
 553                 NI_GPCT_LOADING_ON_TC_BIT = 0x1000,
 554                 NI_GPCT_LOADING_ON_GATE_BIT = 0x4000,
 555                 NI_GPCT_COUNTING_MODE_MASK = 0x7 << NI_GPCT_COUNTING_MODE_SHIFT,
 556                 NI_GPCT_COUNTING_MODE_NORMAL_BITS =
 557                     0x0 << NI_GPCT_COUNTING_MODE_SHIFT,
 558                 NI_GPCT_COUNTING_MODE_QUADRATURE_X1_BITS =
 559                     0x1 << NI_GPCT_COUNTING_MODE_SHIFT,
 560                 NI_GPCT_COUNTING_MODE_QUADRATURE_X2_BITS =
 561                     0x2 << NI_GPCT_COUNTING_MODE_SHIFT,
 562                 NI_GPCT_COUNTING_MODE_QUADRATURE_X4_BITS =
 563                     0x3 << NI_GPCT_COUNTING_MODE_SHIFT,
 564                 NI_GPCT_COUNTING_MODE_TWO_PULSE_BITS =
 565                     0x4 << NI_GPCT_COUNTING_MODE_SHIFT,
 566                 NI_GPCT_COUNTING_MODE_SYNC_SOURCE_BITS =
 567                     0x6 << NI_GPCT_COUNTING_MODE_SHIFT,
 568                 NI_GPCT_INDEX_PHASE_MASK = 0x3 << NI_GPCT_INDEX_PHASE_BITSHIFT,
 569                 NI_GPCT_INDEX_PHASE_LOW_A_LOW_B_BITS =
 570                     0x0 << NI_GPCT_INDEX_PHASE_BITSHIFT,
 571                 NI_GPCT_INDEX_PHASE_LOW_A_HIGH_B_BITS =
 572                     0x1 << NI_GPCT_INDEX_PHASE_BITSHIFT,
 573                 NI_GPCT_INDEX_PHASE_HIGH_A_LOW_B_BITS =
 574                     0x2 << NI_GPCT_INDEX_PHASE_BITSHIFT,
 575                 NI_GPCT_INDEX_PHASE_HIGH_A_HIGH_B_BITS =
 576                     0x3 << NI_GPCT_INDEX_PHASE_BITSHIFT,
 577                 NI_GPCT_INDEX_ENABLE_BIT = 0x400000,
 578                 NI_GPCT_COUNTING_DIRECTION_MASK =
 579                     0x3 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
 580                 NI_GPCT_COUNTING_DIRECTION_DOWN_BITS =
 581                     0x00 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
 582                 NI_GPCT_COUNTING_DIRECTION_UP_BITS =
 583                     0x1 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
 584                 NI_GPCT_COUNTING_DIRECTION_HW_UP_DOWN_BITS =
 585                     0x2 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
 586                 NI_GPCT_COUNTING_DIRECTION_HW_GATE_BITS =
 587                     0x3 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
 588                 NI_GPCT_RELOAD_SOURCE_MASK = 0xc000000,
 589                 NI_GPCT_RELOAD_SOURCE_FIXED_BITS = 0x0,
 590                 NI_GPCT_RELOAD_SOURCE_SWITCHING_BITS = 0x4000000,
 591                 NI_GPCT_RELOAD_SOURCE_GATE_SELECT_BITS = 0x8000000,
 592                 NI_GPCT_OR_GATE_BIT = 0x10000000,
 593                 NI_GPCT_INVERT_OUTPUT_BIT = 0x20000000
 594         };
 595
 596 /* Bits for setting a clock source with
 597  * INSN_CONFIG_SET_CLOCK_SRC when using NI general-purpose counters. */
 598         enum ni_gpct_clock_source_bits {
 599                 NI_GPCT_CLOCK_SRC_SELECT_MASK = 0x3f,
 600                 NI_GPCT_TIMEBASE_1_CLOCK_SRC_BITS = 0x0,
 601                 NI_GPCT_TIMEBASE_2_CLOCK_SRC_BITS = 0x1,
 602                 NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS = 0x2,
 603                 NI_GPCT_LOGIC_LOW_CLOCK_SRC_BITS = 0x3,
 604                 NI_GPCT_NEXT_GATE_CLOCK_SRC_BITS = 0x4,
 605                 NI_GPCT_NEXT_TC_CLOCK_SRC_BITS = 0x5,
 606                 /* NI 660x-specific */
 607                 NI_GPCT_SOURCE_PIN_i_CLOCK_SRC_BITS = 0x6,
 608                 NI_GPCT_PXI10_CLOCK_SRC_BITS = 0x7,
 609                 NI_GPCT_PXI_STAR_TRIGGER_CLOCK_SRC_BITS = 0x8,
 610                 NI_GPCT_ANALOG_TRIGGER_OUT_CLOCK_SRC_BITS = 0x9,
 611                 NI_GPCT_PRESCALE_MODE_CLOCK_SRC_MASK = 0x30000000,
 612                 NI_GPCT_NO_PRESCALE_CLOCK_SRC_BITS = 0x0,
 613                 /* divide source by 2 */
 614                 NI_GPCT_PRESCALE_X2_CLOCK_SRC_BITS = 0x10000000,
 615                 /* divide source by 8 */
 616                 NI_GPCT_PRESCALE_X8_CLOCK_SRC_BITS = 0x20000000,
 617                 NI_GPCT_INVERT_CLOCK_SRC_BIT = 0x80000000
 618         };
 619         static inline unsigned NI_GPCT_SOURCE_PIN_CLOCK_SRC_BITS(unsigned n)
 620         {
 621                 /* NI 660x-specific */
 622                 return 0x10 + n;
 623         }
 624         static inline unsigned NI_GPCT_RTSI_CLOCK_SRC_BITS(unsigned n)
 625         {
 626                 return 0x18 + n;
 627         }
 628         static inline unsigned NI_GPCT_PFI_CLOCK_SRC_BITS(unsigned n)
 629         {
 630                 /* no pfi on NI 660x */
 631                 return 0x20 + n;
 632         }
 633
 634 /* Possibilities for setting a gate source with
 635 INSN_CONFIG_SET_GATE_SRC when using NI general-purpose counters.
 636 May be bitwise-or'd with CR_EDGE or CR_INVERT. */
 637         enum ni_gpct_gate_select {
 638                 /* m-series gates */
 639                 NI_GPCT_TIMESTAMP_MUX_GATE_SELECT = 0x0,
 640                 NI_GPCT_AI_START2_GATE_SELECT = 0x12,
 641                 NI_GPCT_PXI_STAR_TRIGGER_GATE_SELECT = 0x13,
 642                 NI_GPCT_NEXT_OUT_GATE_SELECT = 0x14,
 643                 NI_GPCT_AI_START1_GATE_SELECT = 0x1c,
 644                 NI_GPCT_NEXT_SOURCE_GATE_SELECT = 0x1d,
 645                 NI_GPCT_ANALOG_TRIGGER_OUT_GATE_SELECT = 0x1e,
 646                 NI_GPCT_LOGIC_LOW_GATE_SELECT = 0x1f,
 647                 /* more gates for 660x */
 648                 NI_GPCT_SOURCE_PIN_i_GATE_SELECT = 0x100,
 649                 NI_GPCT_GATE_PIN_i_GATE_SELECT = 0x101,
 650                 /* more gates for 660x "second gate" */
 651                 NI_GPCT_UP_DOWN_PIN_i_GATE_SELECT = 0x201,
 652                 NI_GPCT_SELECTED_GATE_GATE_SELECT = 0x21e,
 653                 /* m-series "second gate" sources are unknown,
 654                  * we should add them here with an offset of 0x300 when
 655                  * known. */
 656                 NI_GPCT_DISABLED_GATE_SELECT = 0x8000,
 657         };
 658         static inline unsigned NI_GPCT_GATE_PIN_GATE_SELECT(unsigned n)
 659         {
 660                 return 0x102 + n;
 661         }
 662         static inline unsigned NI_GPCT_RTSI_GATE_SELECT(unsigned n)
 663         {
 664                 return NI_USUAL_RTSI_SELECT(n);
 665         }
 666         static inline unsigned NI_GPCT_PFI_GATE_SELECT(unsigned n)
 667         {
 668                 return NI_USUAL_PFI_SELECT(n);
 669         }
 670         static inline unsigned NI_GPCT_UP_DOWN_PIN_GATE_SELECT(unsigned n)
 671         {
 672                 return 0x202 + n;
 673         }
 674
 675 /* Possibilities for setting a source with
 676 INSN_CONFIG_SET_OTHER_SRC when using NI general-purpose counters. */
 677         enum ni_gpct_other_index {
 678                 NI_GPCT_SOURCE_ENCODER_A,
 679                 NI_GPCT_SOURCE_ENCODER_B,
 680                 NI_GPCT_SOURCE_ENCODER_Z
 681         };
 682         enum ni_gpct_other_select {
 683                 /* m-series gates */
 684                 /* Still unknown, probably only need NI_GPCT_PFI_OTHER_SELECT */
 685                 NI_GPCT_DISABLED_OTHER_SELECT = 0x8000,
 686         };
 687         static inline unsigned NI_GPCT_PFI_OTHER_SELECT(unsigned n)
 688         {
 689                 return NI_USUAL_PFI_SELECT(n);
 690         }
 691
 692 /* start sources for ni general-purpose counters for use with
 693 INSN_CONFIG_ARM */
 694         enum ni_gpct_arm_source {
 695                 NI_GPCT_ARM_IMMEDIATE = 0x0,
 696                 NI_GPCT_ARM_PAIRED_IMMEDIATE = 0x1, /* Start both the counter
 697                                                      * and the adjacent paired
 698                                                      * counter simultaneously */
 699                 /* NI doesn't document bits for selecting hardware arm triggers.
 700                  * If the NI_GPCT_ARM_UNKNOWN bit is set, we will pass the least
 701                  * significant bits (3 bits for 660x or 5 bits for m-series)
 702                  * through to the hardware.  This will at least allow someone to
 703                  * figure out what the bits do later. */
 704                 NI_GPCT_ARM_UNKNOWN = 0x1000,
 705         };
 706
 707 /* digital filtering options for ni 660x for use with INSN_CONFIG_FILTER. */
 708         enum ni_gpct_filter_select {
 709                 NI_GPCT_FILTER_OFF = 0x0,
 710                 NI_GPCT_FILTER_TIMEBASE_3_SYNC = 0x1,
 711                 NI_GPCT_FILTER_100x_TIMEBASE_1 = 0x2,
 712                 NI_GPCT_FILTER_20x_TIMEBASE_1 = 0x3,
 713                 NI_GPCT_FILTER_10x_TIMEBASE_1 = 0x4,
 714                 NI_GPCT_FILTER_2x_TIMEBASE_1 = 0x5,
 715                 NI_GPCT_FILTER_2x_TIMEBASE_3 = 0x6
 716         };
 717
 718 /* PFI digital filtering options for ni m-series for use with
 719  * INSN_CONFIG_FILTER. */
 720         enum ni_pfi_filter_select {
 721                 NI_PFI_FILTER_OFF = 0x0,
 722                 NI_PFI_FILTER_125ns = 0x1,
 723                 NI_PFI_FILTER_6425ns = 0x2,
 724                 NI_PFI_FILTER_2550us = 0x3
 725         };
 726
 727 /* master clock sources for ni mio boards and INSN_CONFIG_SET_CLOCK_SRC */
 728         enum ni_mio_clock_source {
 729                 NI_MIO_INTERNAL_CLOCK = 0,
 730                 NI_MIO_RTSI_CLOCK = 1,  /* doesn't work for m-series, use
 731                                            NI_MIO_PLL_RTSI_CLOCK() */
 732                 /* the NI_MIO_PLL_* sources are m-series only */
 733                 NI_MIO_PLL_PXI_STAR_TRIGGER_CLOCK = 2,
 734                 NI_MIO_PLL_PXI10_CLOCK = 3,
 735                 NI_MIO_PLL_RTSI0_CLOCK = 4
 736         };
 737         static inline unsigned NI_MIO_PLL_RTSI_CLOCK(unsigned rtsi_channel)
 738         {
 739                 return NI_MIO_PLL_RTSI0_CLOCK + rtsi_channel;
 740         }
 741
 742 /* Signals which can be routed to an NI RTSI pin with INSN_CONFIG_SET_ROUTING.
 743  The numbers assigned are not arbitrary, they correspond to the bits required
 744  to program the board. */
 745         enum ni_rtsi_routing {
 746                 NI_RTSI_OUTPUT_ADR_START1 = 0,
 747                 NI_RTSI_OUTPUT_ADR_START2 = 1,
 748                 NI_RTSI_OUTPUT_SCLKG = 2,
 749                 NI_RTSI_OUTPUT_DACUPDN = 3,
 750                 NI_RTSI_OUTPUT_DA_START1 = 4,
 751                 NI_RTSI_OUTPUT_G_SRC0 = 5,
 752                 NI_RTSI_OUTPUT_G_GATE0 = 6,
 753                 NI_RTSI_OUTPUT_RGOUT0 = 7,
 754                 NI_RTSI_OUTPUT_RTSI_BRD_0 = 8,
 755                 NI_RTSI_OUTPUT_RTSI_OSC = 12    /* pre-m-series always have RTSI
 756                                                  * clock on line 7 */
 757         };
 758         static inline unsigned NI_RTSI_OUTPUT_RTSI_BRD(unsigned n)
 759         {
 760                 return NI_RTSI_OUTPUT_RTSI_BRD_0 + n;
 761         }
 762
 763 /* Signals which can be routed to an NI PFI pin on an m-series board with
 764  * INSN_CONFIG_SET_ROUTING.  These numbers are also returned by
 765  * INSN_CONFIG_GET_ROUTING on pre-m-series boards, even though their routing
 766  * cannot be changed.  The numbers assigned are not arbitrary, they correspond
 767  * to the bits required to program the board. */
 768         enum ni_pfi_routing {
 769                 NI_PFI_OUTPUT_PFI_DEFAULT = 0,
 770                 NI_PFI_OUTPUT_AI_START1 = 1,
 771                 NI_PFI_OUTPUT_AI_START2 = 2,
 772                 NI_PFI_OUTPUT_AI_CONVERT = 3,
 773                 NI_PFI_OUTPUT_G_SRC1 = 4,
 774                 NI_PFI_OUTPUT_G_GATE1 = 5,
 775                 NI_PFI_OUTPUT_AO_UPDATE_N = 6,
 776                 NI_PFI_OUTPUT_AO_START1 = 7,
 777                 NI_PFI_OUTPUT_AI_START_PULSE = 8,
 778                 NI_PFI_OUTPUT_G_SRC0 = 9,
 779                 NI_PFI_OUTPUT_G_GATE0 = 10,
 780                 NI_PFI_OUTPUT_EXT_STROBE = 11,
 781                 NI_PFI_OUTPUT_AI_EXT_MUX_CLK = 12,
 782                 NI_PFI_OUTPUT_GOUT0 = 13,
 783                 NI_PFI_OUTPUT_GOUT1 = 14,
 784                 NI_PFI_OUTPUT_FREQ_OUT = 15,
 785                 NI_PFI_OUTPUT_PFI_DO = 16,
 786                 NI_PFI_OUTPUT_I_ATRIG = 17,
 787                 NI_PFI_OUTPUT_RTSI0 = 18,
 788                 NI_PFI_OUTPUT_PXI_STAR_TRIGGER_IN = 26,
 789                 NI_PFI_OUTPUT_SCXI_TRIG1 = 27,
 790                 NI_PFI_OUTPUT_DIO_CHANGE_DETECT_RTSI = 28,
 791                 NI_PFI_OUTPUT_CDI_SAMPLE = 29,
 792                 NI_PFI_OUTPUT_CDO_UPDATE = 30
 793         };
 794         static inline unsigned NI_PFI_OUTPUT_RTSI(unsigned rtsi_channel)
 795         {
 796                 return NI_PFI_OUTPUT_RTSI0 + rtsi_channel;
 797         }
 798
 799 /* Signals which can be routed to output on a NI PFI pin on a 660x board
 800  with INSN_CONFIG_SET_ROUTING.  The numbers assigned are
 801  not arbitrary, they correspond to the bits required
 802  to program the board.  Lines 0 to 7 can only be set to
 803  NI_660X_PFI_OUTPUT_DIO.  Lines 32 to 39 can only be set to
 804  NI_660X_PFI_OUTPUT_COUNTER. */
 805         enum ni_660x_pfi_routing {
 806                 NI_660X_PFI_OUTPUT_COUNTER = 1, /* counter */
 807                 NI_660X_PFI_OUTPUT_DIO = 2,     /* static digital output */
 808         };
 809
 810 /* NI External Trigger lines.  These values are not arbitrary, but are related
 811  * to the bits required to program the board (offset by 1 for historical
 812  * reasons). */
 813         static inline unsigned NI_EXT_PFI(unsigned pfi_channel)
 814         {
 815                 return NI_USUAL_PFI_SELECT(pfi_channel) - 1;
 816         }
 817         static inline unsigned NI_EXT_RTSI(unsigned rtsi_channel)
 818         {
 819                 return NI_USUAL_RTSI_SELECT(rtsi_channel) - 1;
 820         }
 821
 822 /* status bits for INSN_CONFIG_GET_COUNTER_STATUS */
 823         enum comedi_counter_status_flags {
 824                 COMEDI_COUNTER_ARMED = 0x1,
 825                 COMEDI_COUNTER_COUNTING = 0x2,
 826                 COMEDI_COUNTER_TERMINAL_COUNT = 0x4,
 827         };
 828
 829 /* Clock sources for CDIO subdevice on NI m-series boards.  Used as the
 830  * scan_begin_arg for a comedi_command. These sources may also be bitwise-or'd
 831  * with CR_INVERT to change polarity. */
 832         enum ni_m_series_cdio_scan_begin_src {
 833                 NI_CDIO_SCAN_BEGIN_SRC_GROUND = 0,
 834                 NI_CDIO_SCAN_BEGIN_SRC_AI_START = 18,
 835                 NI_CDIO_SCAN_BEGIN_SRC_AI_CONVERT = 19,
 836                 NI_CDIO_SCAN_BEGIN_SRC_PXI_STAR_TRIGGER = 20,
 837                 NI_CDIO_SCAN_BEGIN_SRC_G0_OUT = 28,
 838                 NI_CDIO_SCAN_BEGIN_SRC_G1_OUT = 29,
 839                 NI_CDIO_SCAN_BEGIN_SRC_ANALOG_TRIGGER = 30,
 840                 NI_CDIO_SCAN_BEGIN_SRC_AO_UPDATE = 31,
 841                 NI_CDIO_SCAN_BEGIN_SRC_FREQ_OUT = 32,
 842                 NI_CDIO_SCAN_BEGIN_SRC_DIO_CHANGE_DETECT_IRQ = 33
 843         };
 844         static inline unsigned NI_CDIO_SCAN_BEGIN_SRC_PFI(unsigned pfi_channel)
 845         {
 846                 return NI_USUAL_PFI_SELECT(pfi_channel);
 847         }
 848         static inline unsigned
 849                 NI_CDIO_SCAN_BEGIN_SRC_RTSI(unsigned rtsi_channel)
 850         {
 851                 return NI_USUAL_RTSI_SELECT(rtsi_channel);
 852         }
 853
 854 /* scan_begin_src for scan_begin_arg==TRIG_EXT with analog output command on NI
 855  * boards.  These scan begin sources can also be bitwise-or'd with CR_INVERT to
 856  * change polarity. */
 857         static inline unsigned NI_AO_SCAN_BEGIN_SRC_PFI(unsigned pfi_channel)
 858         {
 859                 return NI_USUAL_PFI_SELECT(pfi_channel);
 860         }
 861         static inline unsigned NI_AO_SCAN_BEGIN_SRC_RTSI(unsigned rtsi_channel)
 862         {
 863                 return NI_USUAL_RTSI_SELECT(rtsi_channel);
 864         }
 865
 866 /* Bits for setting a clock source with
 867  * INSN_CONFIG_SET_CLOCK_SRC when using NI frequency output subdevice. */
 868         enum ni_freq_out_clock_source_bits {
 869                 NI_FREQ_OUT_TIMEBASE_1_DIV_2_CLOCK_SRC, /* 10 MHz */
 870                 NI_FREQ_OUT_TIMEBASE_2_CLOCK_SRC        /* 100 KHz */
 871         };
 872
 873 /* Values for setting a clock source with INSN_CONFIG_SET_CLOCK_SRC for
 874  * 8254 counter subdevices on Amplicon DIO boards (amplc_dio200 driver). */
 875         enum amplc_dio_clock_source {
 876                 AMPLC_DIO_CLK_CLKN,     /* per channel external clock
 877                                            input/output pin (pin is only an
 878                                            input when clock source set to this
 879                                            value, otherwise it is an output) */
 880                 AMPLC_DIO_CLK_10MHZ,    /* 10 MHz internal clock */
 881                 AMPLC_DIO_CLK_1MHZ,     /* 1 MHz internal clock */
 882                 AMPLC_DIO_CLK_100KHZ,   /* 100 kHz internal clock */
 883                 AMPLC_DIO_CLK_10KHZ,    /* 10 kHz internal clock */
 884                 AMPLC_DIO_CLK_1KHZ,     /* 1 kHz internal clock */
 885                 AMPLC_DIO_CLK_OUTNM1,   /* output of preceding counter channel
 886                                            (for channel 0, preceding counter
 887                                            channel is channel 2 on preceding
 888                                            counter subdevice, for first counter
 889                                            subdevice, preceding counter
 890                                            subdevice is the last counter
 891                                            subdevice) */
 892                 AMPLC_DIO_CLK_EXT       /* per chip external input pin */
 893         };
 894
 895 /* Values for setting a gate source with INSN_CONFIG_SET_GATE_SRC for
 896  * 8254 counter subdevices on Amplicon DIO boards (amplc_dio200 driver). */
 897         enum amplc_dio_gate_source {
 898                 AMPLC_DIO_GAT_VCC,      /* internal high logic level */
 899                 AMPLC_DIO_GAT_GND,      /* internal low logic level */
 900                 AMPLC_DIO_GAT_GATN,     /* per channel external gate input */
 901                 AMPLC_DIO_GAT_NOUTNM2,  /* negated output of counter channel
 902                                            minus 2 (for channels 0 or 1,
 903                                            channel minus 2 is channel 1 or 2 on
 904                                            the preceding counter subdevice, for
 905                                            the first counter subdevice the
 906                                            preceding counter subdevice is the
 907                                            last counter subdevice) */
 908                 AMPLC_DIO_GAT_RESERVED4,
 909                 AMPLC_DIO_GAT_RESERVED5,
 910                 AMPLC_DIO_GAT_RESERVED6,
 911                 AMPLC_DIO_GAT_RESERVED7
 912         };
 913
 914 #endif /* _COMEDI_H */