/* SPDX-License-Identifier: LGPL-2.0+ */
/*
 * comedi.h
 * header file for COMEDI user API
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1998-2001 David A. Schleef <ds@schleef.org>
 */

#ifndef _COMEDI_H
#define _COMEDI_H

#define COMEDI_MAJORVERSION     0
#define COMEDI_MINORVERSION     7
#define COMEDI_MICROVERSION     76
#define VERSION "0.7.76"

/* comedi's major device number */
#define COMEDI_MAJOR 98

/*
 * maximum number of minor devices.  This can be increased, although
 * kernel structures are currently statically allocated, thus you
 * don't want this to be much more than you actually use.
 */
#define COMEDI_NDEVICES 16

/* number of config options in the config structure */
#define COMEDI_NDEVCONFOPTS 32

/*
 * NOTE: 'comedi_config --init-data' is deprecated
 *
 * The following indexes in the config options were used by
 * comedi_config to pass firmware blobs from user space to the
 * comedi drivers. The request_firmware() hotplug interface is
 * now used by all comedi drivers instead.
 */

/* length of nth chunk of firmware data -*/
#define COMEDI_DEVCONF_AUX_DATA3_LENGTH         25
#define COMEDI_DEVCONF_AUX_DATA2_LENGTH         26
#define COMEDI_DEVCONF_AUX_DATA1_LENGTH         27
#define COMEDI_DEVCONF_AUX_DATA0_LENGTH         28
/* most significant 32 bits of pointer address (if needed) */
#define COMEDI_DEVCONF_AUX_DATA_HI              29
/* least significant 32 bits of pointer address */
#define COMEDI_DEVCONF_AUX_DATA_LO              30
#define COMEDI_DEVCONF_AUX_DATA_LENGTH          31      /* total data length */

/* max length of device and driver names */
#define COMEDI_NAMELEN 20

/* packs and unpacks a channel/range number */

#define CR_PACK(chan, rng, aref)                                        \
        ((((aref) & 0x3) << 24) | (((rng) & 0xff) << 16) | (chan))
#define CR_PACK_FLAGS(chan, range, aref, flags)                         \
        (CR_PACK(chan, range, aref) | ((flags) & CR_FLAGS_MASK))

#define CR_CHAN(a)      ((a) & 0xffff)
#define CR_RANGE(a)     (((a) >> 16) & 0xff)
#define CR_AREF(a)      (((a) >> 24) & 0x03)

#define CR_FLAGS_MASK   0xfc000000
#define CR_ALT_FILTER   0x04000000
#define CR_DITHER       CR_ALT_FILTER
#define CR_DEGLITCH     CR_ALT_FILTER
#define CR_ALT_SOURCE   0x08000000
#define CR_EDGE         0x40000000
#define CR_INVERT       0x80000000

#define AREF_GROUND     0x00    /* analog ref = analog ground */
#define AREF_COMMON     0x01    /* analog ref = analog common */
#define AREF_DIFF       0x02    /* analog ref = differential */
#define AREF_OTHER      0x03    /* analog ref = other (undefined) */

/* counters -- these are arbitrary values */
#define GPCT_RESET              0x0001
#define GPCT_SET_SOURCE         0x0002
#define GPCT_SET_GATE           0x0004
#define GPCT_SET_DIRECTION      0x0008
#define GPCT_SET_OPERATION      0x0010
#define GPCT_ARM                0x0020
#define GPCT_DISARM             0x0040
#define GPCT_GET_INT_CLK_FRQ    0x0080

#define GPCT_INT_CLOCK          0x0001
#define GPCT_EXT_PIN            0x0002
#define GPCT_NO_GATE            0x0004
#define GPCT_UP                 0x0008
#define GPCT_DOWN               0x0010
#define GPCT_HWUD               0x0020
#define GPCT_SIMPLE_EVENT       0x0040
#define GPCT_SINGLE_PERIOD      0x0080
#define GPCT_SINGLE_PW          0x0100
#define GPCT_CONT_PULSE_OUT     0x0200
#define GPCT_SINGLE_PULSE_OUT   0x0400

/* instructions */

#define INSN_MASK_WRITE         0x8000000
#define INSN_MASK_READ          0x4000000
#define INSN_MASK_SPECIAL       0x2000000

#define INSN_READ               (0 | INSN_MASK_READ)
#define INSN_WRITE              (1 | INSN_MASK_WRITE)
#define INSN_BITS               (2 | INSN_MASK_READ | INSN_MASK_WRITE)
#define INSN_CONFIG             (3 | INSN_MASK_READ | INSN_MASK_WRITE)
#define INSN_DEVICE_CONFIG      (INSN_CONFIG | INSN_MASK_SPECIAL)
#define INSN_GTOD               (4 | INSN_MASK_READ | INSN_MASK_SPECIAL)
#define INSN_WAIT               (5 | INSN_MASK_WRITE | INSN_MASK_SPECIAL)
#define INSN_INTTRIG            (6 | INSN_MASK_WRITE | INSN_MASK_SPECIAL)

/* command flags */
/* These flags are used in comedi_cmd structures */

#define CMDF_BOGUS              0x00000001      /* do the motions */

/* try to use a real-time interrupt while performing command */
#define CMDF_PRIORITY           0x00000008

/* wake up on end-of-scan events */
#define CMDF_WAKE_EOS           0x00000020

#define CMDF_WRITE              0x00000040

#define CMDF_RAWDATA            0x00000080

/* timer rounding definitions */
#define CMDF_ROUND_MASK         0x00030000
#define CMDF_ROUND_NEAREST      0x00000000
#define CMDF_ROUND_DOWN         0x00010000
#define CMDF_ROUND_UP           0x00020000
#define CMDF_ROUND_UP_NEXT      0x00030000

#define COMEDI_EV_START         0x00040000
#define COMEDI_EV_SCAN_BEGIN    0x00080000
#define COMEDI_EV_CONVERT       0x00100000
#define COMEDI_EV_SCAN_END      0x00200000
#define COMEDI_EV_STOP          0x00400000

/* compatibility definitions */
#define TRIG_BOGUS              CMDF_BOGUS
#define TRIG_RT                 CMDF_PRIORITY
#define TRIG_WAKE_EOS           CMDF_WAKE_EOS
#define TRIG_WRITE              CMDF_WRITE
#define TRIG_ROUND_MASK         CMDF_ROUND_MASK
#define TRIG_ROUND_NEAREST      CMDF_ROUND_NEAREST
#define TRIG_ROUND_DOWN         CMDF_ROUND_DOWN
#define TRIG_ROUND_UP           CMDF_ROUND_UP
#define TRIG_ROUND_UP_NEXT      CMDF_ROUND_UP_NEXT

/* trigger sources */

#define TRIG_ANY        0xffffffff
#define TRIG_INVALID    0x00000000

#define TRIG_NONE       0x00000001 /* never trigger */
#define TRIG_NOW        0x00000002 /* trigger now + N ns */
#define TRIG_FOLLOW     0x00000004 /* trigger on next lower level trig */
#define TRIG_TIME       0x00000008 /* trigger at time N ns */
#define TRIG_TIMER      0x00000010 /* trigger at rate N ns */
#define TRIG_COUNT      0x00000020 /* trigger when count reaches N */
#define TRIG_EXT        0x00000040 /* trigger on external signal N */
#define TRIG_INT        0x00000080 /* trigger on comedi-internal signal N */
#define TRIG_OTHER      0x00000100 /* driver defined */

/* subdevice flags */

#define SDF_BUSY        0x0001  /* device is busy */
#define SDF_BUSY_OWNER  0x0002  /* device is busy with your job */
#define SDF_LOCKED      0x0004  /* subdevice is locked */
#define SDF_LOCK_OWNER  0x0008  /* you own lock */
#define SDF_MAXDATA     0x0010  /* maxdata depends on channel */
#define SDF_FLAGS       0x0020  /* flags depend on channel */
#define SDF_RANGETYPE   0x0040  /* range type depends on channel */
#define SDF_PWM_COUNTER 0x0080  /* PWM can automatically switch off */
#define SDF_PWM_HBRIDGE 0x0100  /* PWM is signed (H-bridge) */
#define SDF_CMD         0x1000  /* can do commands (deprecated) */
#define SDF_SOFT_CALIBRATED     0x2000 /* subdevice uses software calibration */
#define SDF_CMD_WRITE           0x4000 /* can do output commands */
#define SDF_CMD_READ            0x8000 /* can do input commands */

/* subdevice can be read (e.g. analog input) */
#define SDF_READABLE    0x00010000
/* subdevice can be written (e.g. analog output) */
#define SDF_WRITABLE    0x00020000
#define SDF_WRITEABLE   SDF_WRITABLE    /* spelling error in API */
/* subdevice does not have externally visible lines */
#define SDF_INTERNAL    0x00040000
#define SDF_GROUND      0x00100000      /* can do aref=ground */
#define SDF_COMMON      0x00200000      /* can do aref=common */
#define SDF_DIFF        0x00400000      /* can do aref=diff */
#define SDF_OTHER       0x00800000      /* can do aref=other */
#define SDF_DITHER      0x01000000      /* can do dithering */
#define SDF_DEGLITCH    0x02000000      /* can do deglitching */
#define SDF_MMAP        0x04000000      /* can do mmap() */
#define SDF_RUNNING     0x08000000      /* subdevice is acquiring data */
#define SDF_LSAMPL      0x10000000      /* subdevice uses 32-bit samples */
#define SDF_PACKED      0x20000000      /* subdevice can do packed DIO */

/* subdevice types */

/**
 * enum comedi_subdevice_type - COMEDI subdevice types
 * @COMEDI_SUBD_UNUSED:         Unused subdevice.
 * @COMEDI_SUBD_AI:             Analog input.
 * @COMEDI_SUBD_AO:             Analog output.
 * @COMEDI_SUBD_DI:             Digital input.
 * @COMEDI_SUBD_DO:             Digital output.
 * @COMEDI_SUBD_DIO:            Digital input/output.
 * @COMEDI_SUBD_COUNTER:        Counter.
 * @COMEDI_SUBD_TIMER:          Timer.
 * @COMEDI_SUBD_MEMORY:         Memory, EEPROM, DPRAM.
 * @COMEDI_SUBD_CALIB:          Calibration DACs.
 * @COMEDI_SUBD_PROC:           Processor, DSP.
 * @COMEDI_SUBD_SERIAL:         Serial I/O.
 * @COMEDI_SUBD_PWM:            Pulse-Width Modulation output.
 */
enum comedi_subdevice_type {
        COMEDI_SUBD_UNUSED,
        COMEDI_SUBD_AI,
        COMEDI_SUBD_AO,
        COMEDI_SUBD_DI,
        COMEDI_SUBD_DO,
        COMEDI_SUBD_DIO,
        COMEDI_SUBD_COUNTER,
        COMEDI_SUBD_TIMER,
        COMEDI_SUBD_MEMORY,
        COMEDI_SUBD_CALIB,
        COMEDI_SUBD_PROC,
        COMEDI_SUBD_SERIAL,
        COMEDI_SUBD_PWM
};

/* configuration instructions */

/**
 * enum comedi_io_direction - COMEDI I/O directions
 * @COMEDI_INPUT:       Input.
 * @COMEDI_OUTPUT:      Output.
 * @COMEDI_OPENDRAIN:   Open-drain (or open-collector) output.
 *
 * These are used by the %INSN_CONFIG_DIO_QUERY configuration instruction to
 * report a direction.  They may also be used in other places where a direction
 * needs to be specified.
 */
enum comedi_io_direction {
        COMEDI_INPUT = 0,
        COMEDI_OUTPUT = 1,
        COMEDI_OPENDRAIN = 2
};

/**
 * enum configuration_ids - COMEDI configuration instruction codes
 * @INSN_CONFIG_DIO_INPUT:      Configure digital I/O as input.
 * @INSN_CONFIG_DIO_OUTPUT:     Configure digital I/O as output.
 * @INSN_CONFIG_DIO_OPENDRAIN:  Configure digital I/O as open-drain (or open
 *                              collector) output.
 * @INSN_CONFIG_ANALOG_TRIG:    Configure analog trigger.
 * @INSN_CONFIG_ALT_SOURCE:     Configure alternate input source.
 * @INSN_CONFIG_DIGITAL_TRIG:   Configure digital trigger.
 * @INSN_CONFIG_BLOCK_SIZE:     Configure block size for DMA transfers.
 * @INSN_CONFIG_TIMER_1:        Configure divisor for external clock.
 * @INSN_CONFIG_FILTER:         Configure a filter.
 * @INSN_CONFIG_CHANGE_NOTIFY:  Configure change notification for digital
 *                              inputs.  (New drivers should use
 *                              %INSN_CONFIG_DIGITAL_TRIG instead.)
 * @INSN_CONFIG_SERIAL_CLOCK:   Configure clock for serial I/O.
 * @INSN_CONFIG_BIDIRECTIONAL_DATA: Send and receive byte over serial I/O.
 * @INSN_CONFIG_DIO_QUERY:      Query direction of digital I/O channel.
 * @INSN_CONFIG_PWM_OUTPUT:     Configure pulse-width modulator output.
 * @INSN_CONFIG_GET_PWM_OUTPUT: Get pulse-width modulator output configuration.
 * @INSN_CONFIG_ARM:            Arm a subdevice or channel.
 * @INSN_CONFIG_DISARM:         Disarm a subdevice or channel.
 * @INSN_CONFIG_GET_COUNTER_STATUS: Get counter status.
 * @INSN_CONFIG_RESET:          Reset a subdevice or channel.
 * @INSN_CONFIG_GPCT_SINGLE_PULSE_GENERATOR: Configure counter/timer as
 *                              single pulse generator.
 * @INSN_CONFIG_GPCT_PULSE_TRAIN_GENERATOR: Configure counter/timer as
 *                              pulse train generator.
 * @INSN_CONFIG_GPCT_QUADRATURE_ENCODER: Configure counter as a quadrature
 *                              encoder.
 * @INSN_CONFIG_SET_GATE_SRC:   Set counter/timer gate source.
 * @INSN_CONFIG_GET_GATE_SRC:   Get counter/timer gate source.
 * @INSN_CONFIG_SET_CLOCK_SRC:  Set counter/timer master clock source.
 * @INSN_CONFIG_GET_CLOCK_SRC:  Get counter/timer master clock source.
 * @INSN_CONFIG_SET_OTHER_SRC:  Set counter/timer "other" source.
 * @INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: Get size (in bytes) of subdevice's
 *                              on-board FIFOs used during streaming
 *                              input/output.
 * @INSN_CONFIG_SET_COUNTER_MODE: Set counter/timer mode.
 * @INSN_CONFIG_8254_SET_MODE:  (Deprecated) Same as
 *                              %INSN_CONFIG_SET_COUNTER_MODE.
 * @INSN_CONFIG_8254_READ_STATUS: Read status of 8254 counter channel.
 * @INSN_CONFIG_SET_ROUTING:    Set routing for a channel.
 * @INSN_CONFIG_GET_ROUTING:    Get routing for a channel.
 * @INSN_CONFIG_PWM_SET_PERIOD: Set PWM period in nanoseconds.
 * @INSN_CONFIG_PWM_GET_PERIOD: Get PWM period in nanoseconds.
 * @INSN_CONFIG_GET_PWM_STATUS: Get PWM status.
 * @INSN_CONFIG_PWM_SET_H_BRIDGE: Set PWM H bridge duty cycle and polarity for
 *                              a relay simultaneously.
 * @INSN_CONFIG_PWM_GET_H_BRIDGE: Get PWM H bridge duty cycle and polarity.
 * @INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS: Get the hardware timing restraints,
 *                              regardless of trigger sources.
 */
enum configuration_ids {
        INSN_CONFIG_DIO_INPUT = COMEDI_INPUT,
        INSN_CONFIG_DIO_OUTPUT = COMEDI_OUTPUT,
        INSN_CONFIG_DIO_OPENDRAIN = COMEDI_OPENDRAIN,
        INSN_CONFIG_ANALOG_TRIG = 16,
/*      INSN_CONFIG_WAVEFORM = 17, */
/*      INSN_CONFIG_TRIG = 18, */
/*      INSN_CONFIG_COUNTER = 19, */
        INSN_CONFIG_ALT_SOURCE = 20,
        INSN_CONFIG_DIGITAL_TRIG = 21,
        INSN_CONFIG_BLOCK_SIZE = 22,
        INSN_CONFIG_TIMER_1 = 23,
        INSN_CONFIG_FILTER = 24,
        INSN_CONFIG_CHANGE_NOTIFY = 25,

        INSN_CONFIG_SERIAL_CLOCK = 26,  /*ALPHA*/
        INSN_CONFIG_BIDIRECTIONAL_DATA = 27,
        INSN_CONFIG_DIO_QUERY = 28,
        INSN_CONFIG_PWM_OUTPUT = 29,
        INSN_CONFIG_GET_PWM_OUTPUT = 30,
        INSN_CONFIG_ARM = 31,
        INSN_CONFIG_DISARM = 32,
        INSN_CONFIG_GET_COUNTER_STATUS = 33,
        INSN_CONFIG_RESET = 34,
        INSN_CONFIG_GPCT_SINGLE_PULSE_GENERATOR = 1001,
        INSN_CONFIG_GPCT_PULSE_TRAIN_GENERATOR = 1002,
        INSN_CONFIG_GPCT_QUADRATURE_ENCODER = 1003,
        INSN_CONFIG_SET_GATE_SRC = 2001,
        INSN_CONFIG_GET_GATE_SRC = 2002,
        INSN_CONFIG_SET_CLOCK_SRC = 2003,
        INSN_CONFIG_GET_CLOCK_SRC = 2004,
        INSN_CONFIG_SET_OTHER_SRC = 2005,
        INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE = 2006,
        INSN_CONFIG_SET_COUNTER_MODE = 4097,
        INSN_CONFIG_8254_SET_MODE = INSN_CONFIG_SET_COUNTER_MODE,
        INSN_CONFIG_8254_READ_STATUS = 4098,
        INSN_CONFIG_SET_ROUTING = 4099,
        INSN_CONFIG_GET_ROUTING = 4109,
        INSN_CONFIG_PWM_SET_PERIOD = 5000,
        INSN_CONFIG_PWM_GET_PERIOD = 5001,
        INSN_CONFIG_GET_PWM_STATUS = 5002,
        INSN_CONFIG_PWM_SET_H_BRIDGE = 5003,
        INSN_CONFIG_PWM_GET_H_BRIDGE = 5004,
        INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS = 5005,
};

/**
 * enum device_configuration_ids - COMEDI configuration instruction codes global
 * to an entire device.
 * @INSN_DEVICE_CONFIG_TEST_ROUTE:      Validate the possibility of a
 *                                      globally-named route
 * @INSN_DEVICE_CONFIG_CONNECT_ROUTE:   Connect a globally-named route
 * @INSN_DEVICE_CONFIG_DISCONNECT_ROUTE:Disconnect a globally-named route
 * @INSN_DEVICE_CONFIG_GET_ROUTES:      Get a list of all globally-named routes
 *                                      that are valid for a particular device.
 */
enum device_config_route_ids {
        INSN_DEVICE_CONFIG_TEST_ROUTE = 0,
        INSN_DEVICE_CONFIG_CONNECT_ROUTE = 1,
        INSN_DEVICE_CONFIG_DISCONNECT_ROUTE = 2,
        INSN_DEVICE_CONFIG_GET_ROUTES = 3,
};

/**
 * enum comedi_digital_trig_op - operations for configuring a digital trigger
 * @COMEDI_DIGITAL_TRIG_DISABLE:        Return digital trigger to its default,
 *                                      inactive, unconfigured state.
 * @COMEDI_DIGITAL_TRIG_ENABLE_EDGES:   Set rising and/or falling edge inputs
 *                                      that each can fire the trigger.
 * @COMEDI_DIGITAL_TRIG_ENABLE_LEVELS:  Set a combination of high and/or low
 *                                      level inputs that can fire the trigger.
 *
 * These are used with the %INSN_CONFIG_DIGITAL_TRIG configuration instruction.
 * The data for the configuration instruction is as follows...
 *
 *   data[%0] = %INSN_CONFIG_DIGITAL_TRIG
 *
 *   data[%1] = trigger ID
 *
 *   data[%2] = configuration operation
 *
 *   data[%3] = configuration parameter 1
 *
 *   data[%4] = configuration parameter 2
 *
 *   data[%5] = configuration parameter 3
 *
 * The trigger ID (data[%1]) is used to differentiate multiple digital triggers
 * belonging to the same subdevice.  The configuration operation (data[%2]) is
 * one of the enum comedi_digital_trig_op values.  The configuration
 * parameters (data[%3], data[%4], and data[%5]) depend on the operation; they
 * are not used with %COMEDI_DIGITAL_TRIG_DISABLE.
 *
 * For %COMEDI_DIGITAL_TRIG_ENABLE_EDGES and %COMEDI_DIGITAL_TRIG_ENABLE_LEVELS,
 * configuration parameter 1 (data[%3]) contains a "left-shift" value that
 * specifies the input corresponding to bit 0 of configuration parameters 2
 * and 3.  This is useful if the trigger has more than 32 inputs.
 *
 * For %COMEDI_DIGITAL_TRIG_ENABLE_EDGES, configuration parameter 2 (data[%4])
 * specifies which of up to 32 inputs have rising-edge sensitivity, and
 * configuration parameter 3 (data[%5]) specifies which of up to 32 inputs
 * have falling-edge sensitivity that can fire the trigger.
 *
 * For %COMEDI_DIGITAL_TRIG_ENABLE_LEVELS, configuration parameter 2 (data[%4])
 * specifies which of up to 32 inputs must be at a high level, and
 * configuration parameter 3 (data[%5]) specifies which of up to 32 inputs
 * must be at a low level for the trigger to fire.
 *
 * Some sequences of %INSN_CONFIG_DIGITAL_TRIG instructions may have a (partly)
 * accumulative effect, depending on the low-level driver.  This is useful
 * when setting up a trigger that has more than 32 inputs, or has a combination
 * of edge- and level-triggered inputs.
 */
enum comedi_digital_trig_op {
        COMEDI_DIGITAL_TRIG_DISABLE = 0,
        COMEDI_DIGITAL_TRIG_ENABLE_EDGES = 1,
        COMEDI_DIGITAL_TRIG_ENABLE_LEVELS = 2
};

/**
 * enum comedi_support_level - support level for a COMEDI feature
 * @COMEDI_UNKNOWN_SUPPORT:     Unspecified support for feature.
 * @COMEDI_SUPPORTED:           Feature is supported.
 * @COMEDI_UNSUPPORTED:         Feature is unsupported.
 */
enum comedi_support_level {
        COMEDI_UNKNOWN_SUPPORT = 0,
        COMEDI_SUPPORTED,
        COMEDI_UNSUPPORTED
};

/**
 * enum comedi_counter_status_flags - counter status bits
 * @COMEDI_COUNTER_ARMED:               Counter is armed.
 * @COMEDI_COUNTER_COUNTING:            Counter is counting.
 * @COMEDI_COUNTER_TERMINAL_COUNT:      Counter reached terminal count.
 *
 * These bitwise values are used by the %INSN_CONFIG_GET_COUNTER_STATUS
 * configuration instruction to report the status of a counter.
 */
enum comedi_counter_status_flags {
        COMEDI_COUNTER_ARMED = 0x1,
        COMEDI_COUNTER_COUNTING = 0x2,
        COMEDI_COUNTER_TERMINAL_COUNT = 0x4,
};

/* ioctls */

#define CIO 'd'
#define COMEDI_DEVCONFIG _IOW(CIO, 0, struct comedi_devconfig)
#define COMEDI_DEVINFO _IOR(CIO, 1, struct comedi_devinfo)
#define COMEDI_SUBDINFO _IOR(CIO, 2, struct comedi_subdinfo)
#define COMEDI_CHANINFO _IOR(CIO, 3, struct comedi_chaninfo)
/* _IOWR(CIO, 4, ...) is reserved */
#define COMEDI_LOCK _IO(CIO, 5)
#define COMEDI_UNLOCK _IO(CIO, 6)
#define COMEDI_CANCEL _IO(CIO, 7)
#define COMEDI_RANGEINFO _IOR(CIO, 8, struct comedi_rangeinfo)
#define COMEDI_CMD _IOR(CIO, 9, struct comedi_cmd)
#define COMEDI_CMDTEST _IOR(CIO, 10, struct comedi_cmd)
#define COMEDI_INSNLIST _IOR(CIO, 11, struct comedi_insnlist)
#define COMEDI_INSN _IOR(CIO, 12, struct comedi_insn)
#define COMEDI_BUFCONFIG _IOR(CIO, 13, struct comedi_bufconfig)
#define COMEDI_BUFINFO _IOWR(CIO, 14, struct comedi_bufinfo)
#define COMEDI_POLL _IO(CIO, 15)
#define COMEDI_SETRSUBD _IO(CIO, 16)
#define COMEDI_SETWSUBD _IO(CIO, 17)

/* structures */

/**
 * struct comedi_insn - COMEDI instruction
 * @insn:       COMEDI instruction type (%INSN_xxx).
 * @n:          Length of @data[].
 * @data:       Pointer to data array operated on by the instruction.
 * @subdev:     Subdevice index.
 * @chanspec:   A packed "chanspec" value consisting of channel number,
 *              analog range index, analog reference type, and flags.
 * @unused:     Reserved for future use.
 *
 * This is used with the %COMEDI_INSN ioctl, and indirectly with the
 * %COMEDI_INSNLIST ioctl.
 */
struct comedi_insn {
        unsigned int insn;
        unsigned int n;
        unsigned int __user *data;
        unsigned int subdev;
        unsigned int chanspec;
        unsigned int unused[3];
};

/**
 * struct comedi_insnlist - list of COMEDI instructions
 * @n_insns:    Number of COMEDI instructions.
 * @insns:      Pointer to array COMEDI instructions.
 *
 * This is used with the %COMEDI_INSNLIST ioctl.
 */
struct comedi_insnlist {
        unsigned int n_insns;
        struct comedi_insn __user *insns;
};

/**
 * struct comedi_cmd - COMEDI asynchronous acquisition command details
 * @subdev:             Subdevice index.
 * @flags:              Command flags (%CMDF_xxx).
 * @start_src:          "Start acquisition" trigger source (%TRIG_xxx).
 * @start_arg:          "Start acquisition" trigger argument.
 * @scan_begin_src:     "Scan begin" trigger source.
 * @scan_begin_arg:     "Scan begin" trigger argument.
 * @convert_src:        "Convert" trigger source.
 * @convert_arg:        "Convert" trigger argument.
 * @scan_end_src:       "Scan end" trigger source.
 * @scan_end_arg:       "Scan end" trigger argument.
 * @stop_src:           "Stop acquisition" trigger source.
 * @stop_arg:           "Stop acquisition" trigger argument.
 * @chanlist:           Pointer to array of "chanspec" values, containing a
 *                      sequence of channel numbers packed with analog range
 *                      index, etc.
 * @chanlist_len:       Number of channels in sequence.
 * @data:               Pointer to miscellaneous set-up data (not used).
 * @data_len:           Length of miscellaneous set-up data.
 *
 * This is used with the %COMEDI_CMD or %COMEDI_CMDTEST ioctl to set-up
 * or validate an asynchronous acquisition command.  The ioctl may modify
 * the &struct comedi_cmd and copy it back to the caller.
 *
 * Optional command @flags values that can be ORed together...
 *
 * %CMDF_BOGUS - makes %COMEDI_CMD ioctl return error %EAGAIN instead of
 * starting the command.
 *
 * %CMDF_PRIORITY - requests "hard real-time" processing (which is not
 * supported in this version of COMEDI).
 *
 * %CMDF_WAKE_EOS - requests the command makes data available for reading
 * after every "scan" period.
 *
 * %CMDF_WRITE - marks the command as being in the "write" (to device)
 * direction.  This does not need to be specified by the caller unless the
 * subdevice supports commands in either direction.
 *
 * %CMDF_RAWDATA - prevents the command from "munging" the data between the
 * COMEDI sample format and the raw hardware sample format.
 *
 * %CMDF_ROUND_NEAREST - requests timing periods to be rounded to nearest
 * supported values.
 *
 * %CMDF_ROUND_DOWN - requests timing periods to be rounded down to supported
 * values (frequencies rounded up).
 *
 * %CMDF_ROUND_UP - requests timing periods to be rounded up to supported
 * values (frequencies rounded down).
 *
 * Trigger source values for @start_src, @scan_begin_src, @convert_src,
 * @scan_end_src, and @stop_src...
 *
 * %TRIG_ANY - "all ones" value used to test which trigger sources are
 * supported.
 *
 * %TRIG_INVALID - "all zeroes" value used to indicate that all requested
 * trigger sources are invalid.
 *
 * %TRIG_NONE - never trigger (often used as a @stop_src value).
 *
 * %TRIG_NOW - trigger after '_arg' nanoseconds.
 *
 * %TRIG_FOLLOW - trigger follows another event.
 *
 * %TRIG_TIMER - trigger every '_arg' nanoseconds.
 *
 * %TRIG_COUNT - trigger when count '_arg' is reached.
 *
 * %TRIG_EXT - trigger on external signal specified by '_arg'.
 *
 * %TRIG_INT - trigger on internal, software trigger specified by '_arg'.
 *
 * %TRIG_OTHER - trigger on other, driver-defined signal specified by '_arg'.
 */
struct comedi_cmd {
        unsigned int subdev;
        unsigned int flags;

        unsigned int start_src;
        unsigned int start_arg;

        unsigned int scan_begin_src;
        unsigned int scan_begin_arg;

        unsigned int convert_src;
        unsigned int convert_arg;

        unsigned int scan_end_src;
        unsigned int scan_end_arg;

        unsigned int stop_src;
        unsigned int stop_arg;

        unsigned int *chanlist;
        unsigned int chanlist_len;

        short __user *data;
        unsigned int data_len;
};

/**
 * struct comedi_chaninfo - used to retrieve per-channel information
 * @subdev:             Subdevice index.
 * @maxdata_list:       Optional pointer to per-channel maximum data values.
 * @flaglist:           Optional pointer to per-channel flags.
 * @rangelist:          Optional pointer to per-channel range types.
 * @unused:             Reserved for future use.
 *
 * This is used with the %COMEDI_CHANINFO ioctl to get per-channel information
 * for the subdevice.  Use of this requires knowledge of the number of channels
 * and subdevice flags obtained using the %COMEDI_SUBDINFO ioctl.
 *
 * The @maxdata_list member must be %NULL unless the %SDF_MAXDATA subdevice
 * flag is set.  The @flaglist member must be %NULL unless the %SDF_FLAGS
 * subdevice flag is set.  The @rangelist member must be %NULL unless the
 * %SDF_RANGETYPE subdevice flag is set.  Otherwise, the arrays they point to
 * must be at least as long as the number of channels.
 */
struct comedi_chaninfo {
        unsigned int subdev;
        unsigned int __user *maxdata_list;
        unsigned int __user *flaglist;
        unsigned int __user *rangelist;
        unsigned int unused[4];
};

/**
 * struct comedi_rangeinfo - used to retrieve the range table for a channel
 * @range_type:         Encodes subdevice index (bits 27:24), channel index
 *                      (bits 23:16) and range table length (bits 15:0).
 * @range_ptr:          Pointer to array of @struct comedi_krange to be filled
 *                      in with the range table for the channel or subdevice.
 *
 * This is used with the %COMEDI_RANGEINFO ioctl to retrieve the range table
 * for a specific channel (if the subdevice has the %SDF_RANGETYPE flag set to
 * indicate that the range table depends on the channel), or for the subdevice
 * as a whole (if the %SDF_RANGETYPE flag is clear, indicating the range table
 * is shared by all channels).
 *
 * The @range_type value is an input to the ioctl and comes from a previous
 * use of the %COMEDI_SUBDINFO ioctl (if the %SDF_RANGETYPE flag is clear),
 * or the %COMEDI_CHANINFO ioctl (if the %SDF_RANGETYPE flag is set).
 */
struct comedi_rangeinfo {
        unsigned int range_type;
        void __user *range_ptr;
};

/**
 * struct comedi_krange - describes a range in a range table
 * @min:        Minimum value in millionths (1e-6) of a unit.
 * @max:        Maximum value in millionths (1e-6) of a unit.
 * @flags:      Indicates the units (in bits 7:0) OR'ed with optional flags.
 *
 * A range table is associated with a single channel, or with all channels in a
 * subdevice, and a list of one or more ranges.  A %struct comedi_krange
 * describes the physical range of units for one of those ranges.  Sample
 * values in COMEDI are unsigned from %0 up to some 'maxdata' value.  The
 * mapping from sample values to physical units is assumed to be nomimally
 * linear (for the purpose of describing the range), with sample value %0
 * mapping to @min, and the 'maxdata' sample value mapping to @max.
 *
 * The currently defined units are %UNIT_volt (%0), %UNIT_mA (%1), and
 * %UNIT_none (%2).  The @min and @max values are the physical range multiplied
 * by 1e6, so a @max value of %1000000 (with %UNIT_volt) represents a maximal
 * value of 1 volt.
 *
 * The only defined flag value is %RF_EXTERNAL (%0x100), indicating that the
 * range needs to be multiplied by an external reference.
 */
struct comedi_krange {
        int min;
        int max;
        unsigned int flags;
};

/**
 * struct comedi_subdinfo - used to retrieve information about a subdevice
 * @type:               Type of subdevice from &enum comedi_subdevice_type.
 * @n_chan:             Number of channels the subdevice supports.
 * @subd_flags:         A mixture of static and dynamic flags describing
 *                      aspects of the subdevice and its current state.
 * @timer_type:         Timer type.  Always set to %5 ("nanosecond timer").
 * @len_chanlist:       Maximum length of a channel list if the subdevice
 *                      supports asynchronous acquisition commands.
 * @maxdata:            Maximum sample value for all channels if the
 *                      %SDF_MAXDATA subdevice flag is clear.
 * @flags:              Channel flags for all channels if the %SDF_FLAGS
 *                      subdevice flag is clear.
 * @range_type:         The range type for all channels if the %SDF_RANGETYPE
 *                      subdevice flag is clear.  Encodes the subdevice index
 *                      (bits 27:24), a dummy channel index %0 (bits 23:16),
 *                      and the range table length (bits 15:0).
 * @settling_time_0:    Not used.
 * @insn_bits_support:  Set to %COMEDI_SUPPORTED if the subdevice supports the
 *                      %INSN_BITS instruction, or to %COMEDI_UNSUPPORTED if it
 *                      does not.
 * @unused:             Reserved for future use.
 *
 * This is used with the %COMEDI_SUBDINFO ioctl which copies an array of
 * &struct comedi_subdinfo back to user space, with one element per subdevice.
 * Use of this requires knowledge of the number of subdevices obtained from
 * the %COMEDI_DEVINFO ioctl.
 *
 * These are the @subd_flags values that may be ORed together...
 *
 * %SDF_BUSY - the subdevice is busy processing an asynchronous command or a
 * synchronous instruction.
 *
 * %SDF_BUSY_OWNER - the subdevice is busy processing an asynchronous
 * acquisition command started on the current file object (the file object
 * issuing the %COMEDI_SUBDINFO ioctl).
 *
 * %SDF_LOCKED - the subdevice is locked by a %COMEDI_LOCK ioctl.
 *
 * %SDF_LOCK_OWNER - the subdevice is locked by a %COMEDI_LOCK ioctl from the
 * current file object.
 *
 * %SDF_MAXDATA - maximum sample values are channel-specific.
 *
 * %SDF_FLAGS - channel flags are channel-specific.
 *
 * %SDF_RANGETYPE - range types are channel-specific.
 *
 * %SDF_PWM_COUNTER - PWM can switch off automatically.
 *
 * %SDF_PWM_HBRIDGE - or PWM is signed (H-bridge).
 *
 * %SDF_CMD - the subdevice supports asynchronous commands.
 *
 * %SDF_SOFT_CALIBRATED - the subdevice uses software calibration.
 *
 * %SDF_CMD_WRITE - the subdevice supports asynchronous commands in the output
 * ("write") direction.
 *
 * %SDF_CMD_READ - the subdevice supports asynchronous commands in the input
 * ("read") direction.
 *
 * %SDF_READABLE - the subdevice is readable (e.g. analog input).
 *
 * %SDF_WRITABLE (aliased as %SDF_WRITEABLE) - the subdevice is writable (e.g.
 * analog output).
 *
 * %SDF_INTERNAL - the subdevice has no externally visible lines.
 *
 * %SDF_GROUND - the subdevice can use ground as an analog reference.
 *
 * %SDF_COMMON - the subdevice can use a common analog reference.
 *
 * %SDF_DIFF - the subdevice can use differential inputs (or outputs).
 *
 * %SDF_OTHER - the subdevice can use some other analog reference.
 *
 * %SDF_DITHER - the subdevice can do dithering.
 *
 * %SDF_DEGLITCH - the subdevice can do deglitching.
 *
 * %SDF_MMAP - this is never set.
 *
 * %SDF_RUNNING - an asynchronous command is still running.
 *
 * %SDF_LSAMPL - the subdevice uses "long" (32-bit) samples (for asynchronous
 * command data).
 *
 * %SDF_PACKED - the subdevice packs several DIO samples into a single sample
 * (for asynchronous command data).
 *
 * No "channel flags" (@flags) values are currently defined.
 */
struct comedi_subdinfo {
        unsigned int type;
        unsigned int n_chan;
        unsigned int subd_flags;
        unsigned int timer_type;
        unsigned int len_chanlist;
        unsigned int maxdata;
        unsigned int flags;
        unsigned int range_type;
        unsigned int settling_time_0;
        unsigned int insn_bits_support;
        unsigned int unused[8];
};

/**
 * struct comedi_devinfo - used to retrieve information about a COMEDI device
 * @version_code:       COMEDI version code.
 * @n_subdevs:          Number of subdevices the device has.
 * @driver_name:        Null-terminated COMEDI driver name.
 * @board_name:         Null-terminated COMEDI board name.
 * @read_subdevice:     Index of the current "read" subdevice (%-1 if none).
 * @write_subdevice:    Index of the current "write" subdevice (%-1 if none).
 * @unused:             Reserved for future use.
 *
 * This is used with the %COMEDI_DEVINFO ioctl to get basic information about
 * the device.
 */
struct comedi_devinfo {
        unsigned int version_code;
        unsigned int n_subdevs;
        char driver_name[COMEDI_NAMELEN];
        char board_name[COMEDI_NAMELEN];
        int read_subdevice;
        int write_subdevice;
        int unused[30];
};

/**
 * struct comedi_devconfig - used to configure a legacy COMEDI device
 * @board_name:         Null-terminated string specifying the type of board
 *                      to configure.
 * @options:            An array of integer configuration options.
 *
 * This is used with the %COMEDI_DEVCONFIG ioctl to configure a "legacy" COMEDI
 * device, such as an ISA card.  Not all COMEDI drivers support this.  Those
 * that do either expect the specified board name to match one of a list of
 * names registered with the COMEDI core, or expect the specified board name
 * to match the COMEDI driver name itself.  The configuration options are
 * handled in a driver-specific manner.
 */
struct comedi_devconfig {
        char board_name[COMEDI_NAMELEN];
        int options[COMEDI_NDEVCONFOPTS];
};

/**
 * struct comedi_bufconfig - used to set or get buffer size for a subdevice
 * @subdevice:          Subdevice index.
 * @flags:              Not used.
 * @maximum_size:       Maximum allowed buffer size.
 * @size:               Buffer size.
 * @unused:             Reserved for future use.
 *
 * This is used with the %COMEDI_BUFCONFIG ioctl to get or configure the
 * maximum buffer size and current buffer size for a COMEDI subdevice that
 * supports asynchronous commands.  If the subdevice does not support
 * asynchronous commands, @maximum_size and @size are ignored and set to 0.
 *
 * On ioctl input, non-zero values of @maximum_size and @size specify a
 * new maximum size and new current size (in bytes), respectively.  These
 * will by rounded up to a multiple of %PAGE_SIZE.  Specifying a new maximum
 * size requires admin capabilities.
 *
 * On ioctl output, @maximum_size and @size and set to the current maximum
 * buffer size and current buffer size, respectively.
 */
struct comedi_bufconfig {
        unsigned int subdevice;
        unsigned int flags;

        unsigned int maximum_size;
        unsigned int size;

        unsigned int unused[4];
};

/**
 * struct comedi_bufinfo - used to manipulate buffer position for a subdevice
 * @subdevice:          Subdevice index.
 * @bytes_read:         Specify amount to advance read position for an
 *                      asynchronous command in the input ("read") direction.
 * @buf_write_ptr:      Current write position (index) within the buffer.
 * @buf_read_ptr:       Current read position (index) within the buffer.
 * @buf_write_count:    Total amount written, modulo 2^32.
 * @buf_read_count:     Total amount read, modulo 2^32.
 * @bytes_written:      Specify amount to advance write position for an
 *                      asynchronous command in the output ("write") direction.
 * @unused:             Reserved for future use.
 *
 * This is used with the %COMEDI_BUFINFO ioctl to optionally advance the
 * current read or write position in an asynchronous acquisition data buffer,
 * and to get the current read and write positions in the buffer.
 */
struct comedi_bufinfo {
        unsigned int subdevice;
        unsigned int bytes_read;

        unsigned int buf_write_ptr;
        unsigned int buf_read_ptr;
        unsigned int buf_write_count;
        unsigned int buf_read_count;

        unsigned int bytes_written;

        unsigned int unused[4];
};

/* range stuff */

#define __RANGE(a, b)   ((((a) & 0xffff) << 16) | ((b) & 0xffff))

#define RANGE_OFFSET(a)         (((a) >> 16) & 0xffff)
#define RANGE_LENGTH(b)         ((b) & 0xffff)

#define RF_UNIT(flags)          ((flags) & 0xff)
#define RF_EXTERNAL             0x100

#define UNIT_volt               0
#define UNIT_mA                 1
#define UNIT_none               2

#define COMEDI_MIN_SPEED        0xffffffffu

/**********************************************************/
/* everything after this line is ALPHA */
/**********************************************************/

/*
 * 8254 specific configuration.
 *
 * It supports two config commands:
 *
 * 0 ID: INSN_CONFIG_SET_COUNTER_MODE
 * 1 8254 Mode
 * I8254_MODE0, I8254_MODE1, ..., I8254_MODE5
 * OR'ed with:
 * I8254_BCD, I8254_BINARY
 *
 * 0 ID: INSN_CONFIG_8254_READ_STATUS
 * 1 <-- Status byte returned here.
 * B7 = Output
 * B6 = NULL Count
 * B5 - B0 Current mode.
 */

enum i8254_mode {
        I8254_MODE0 = (0 << 1), /* Interrupt on terminal count */
        I8254_MODE1 = (1 << 1), /* Hardware retriggerable one-shot */
        I8254_MODE2 = (2 << 1), /* Rate generator */
        I8254_MODE3 = (3 << 1), /* Square wave mode */
        I8254_MODE4 = (4 << 1), /* Software triggered strobe */
        /* Hardware triggered strobe (retriggerable) */
        I8254_MODE5 = (5 << 1),
        /* Use binary-coded decimal instead of binary (pretty useless) */
        I8254_BCD = 1,
        I8254_BINARY = 0
};

/* *** BEGIN GLOBALLY-NAMED NI TERMINALS/SIGNALS *** */

/*
 * Common National Instruments Terminal/Signal names.
 * Some of these have no NI_ prefix as they are useful for non-NI hardware, such
 * as those that utilize the PXI/RTSI trigger lines.
 *
 * NOTE ABOUT THE CHOICE OF NAMES HERE AND THE CAMELSCRIPT:
 *   The choice to use CamelScript and the exact names below is for
 *   maintainability, clarity, similarity to manufacturer's documentation,
 *   _and_ a mitigation for confusion that has plagued the use of these drivers
 *   for years!
 *
 *   More detail:
 *   There have been significant confusions over the past many years for users
 *   when trying to understand how to connect to/from signals and terminals on
 *   NI hardware using comedi.  The major reason for this is that the actual
 *   register values were exposed and required to be used by users.  Several
 *   major reasons exist why this caused major confusion for users:
 *   1) The register values are _NOT_ in user documentation, but rather in
 *     arcane locations, such as a few register programming manuals that are
 *     increasingly hard to find and the NI MHDDK (comments in example code).
 *     There is no one place to find the various valid values of the registers.
 *   2) The register values are _NOT_ completely consistent.  There is no way to
 *     gain any sense of intuition of which values, or even enums one should use
 *     for various registers.  There was some attempt in prior use of comedi to
 *     name enums such that a user might know which enums should be used for
 *     varying purposes, but the end-user had to gain a knowledge of register
 *     values to correctly wield this approach.
 *   3) The names for signals and registers found in the various register level
 *     programming manuals and vendor-provided documentation are _not_ even
 *     close to the same names that are in the end-user documentation.
 *
 *   Similar, albeit less, confusion plagued NI's previous version of their own
 *   drivers.  Earlier than 2003, NI greatly simplified the situation for users
 *   by releasing a new API that abstracted the names of signals/terminals to a
 *   common and intuitive set of names.
 *
 *   The names below mirror the names chosen and well documented by NI.  These
 *   names are exposed to the user via the comedilib user library.  By keeping
 *   the names below, in spite of the use of CamelScript, maintenance will be
 *   greatly eased and confusion for users _and_ comedi developers will be
 *   greatly reduced.
 */

/*
 * Base of abstracted NI names.
 * The first 16 bits of *_arg are reserved for channel selection.
 * Since we only actually need the first 4 or 5 bits for all register values on

 * NI select registers anyways, we'll identify all values >= (1<<15) as being an
 * abstracted NI signal/terminal name.
 * These values are also used/returned by INSN_DEVICE_CONFIG_TEST_ROUTE,
 * INSN_DEVICE_CONFIG_CONNECT_ROUTE, INSN_DEVICE_CONFIG_DISCONNECT_ROUTE,
 * and INSN_DEVICE_CONFIG_GET_ROUTES.
 */
#define NI_NAMES_BASE   0x8000u

#define _TERM_N(base, n, x)     ((base) + ((x) & ((n) - 1)))

/*
 * not necessarily all allowed 64 PFIs are valid--certainly not for all devices
 */
#define NI_PFI(x)               _TERM_N(NI_NAMES_BASE, 64, x)
/* 8 trigger lines by standard, Some devices cannot talk to all eight. */
#define TRIGGER_LINE(x)         _TERM_N(NI_PFI(-1) + 1, 8, x)
/* 4 RTSI shared MUXes to route signals to/from TRIGGER_LINES on NI hardware */
#define NI_RTSI_BRD(x)          _TERM_N(TRIGGER_LINE(-1) + 1, 4, x)

/* *** Counter/timer names : 8 counters max *** */
#define NI_MAX_COUNTERS         8
#define NI_COUNTER_NAMES_BASE   (NI_RTSI_BRD(-1)  + 1)
#define NI_CtrSource(x)       _TERM_N(NI_COUNTER_NAMES_BASE, NI_MAX_COUNTERS, x)
/* Gate, Aux, A,B,Z are all treated, at times as gates */
#define NI_GATES_NAMES_BASE     (NI_CtrSource(-1) + 1)
#define NI_CtrGate(x)           _TERM_N(NI_GATES_NAMES_BASE, NI_MAX_COUNTERS, x)
#define NI_CtrAux(x)            _TERM_N(NI_CtrGate(-1)  + 1, NI_MAX_COUNTERS, x)
#define NI_CtrA(x)              _TERM_N(NI_CtrAux(-1)   + 1, NI_MAX_COUNTERS, x)
#define NI_CtrB(x)              _TERM_N(NI_CtrA(-1)     + 1, NI_MAX_COUNTERS, x)
#define NI_CtrZ(x)              _TERM_N(NI_CtrB(-1)     + 1, NI_MAX_COUNTERS, x)
#define NI_GATES_NAMES_MAX      NI_CtrZ(-1)
#define NI_CtrArmStartTrigger(x) _TERM_N(NI_CtrZ(-1)    + 1, NI_MAX_COUNTERS, x)
#define NI_CtrInternalOutput(x) \
                      _TERM_N(NI_CtrArmStartTrigger(-1) + 1, NI_MAX_COUNTERS, x)
/** external pin(s) labeled conveniently as Ctr<i>Out. */
#define NI_CtrOut(x)   _TERM_N(NI_CtrInternalOutput(-1) + 1, NI_MAX_COUNTERS, x)
/** For Buffered sampling of ctr -- x series capability. */
#define NI_CtrSampleClock(x)    _TERM_N(NI_CtrOut(-1)   + 1, NI_MAX_COUNTERS, x)
#define NI_COUNTER_NAMES_MAX    NI_CtrSampleClock(-1)

enum ni_common_signal_names {
        /* PXI_Star: this is a non-NI-specific signal */
        PXI_Star = NI_COUNTER_NAMES_MAX + 1,
        PXI_Clk10,
        PXIe_Clk100,
        NI_AI_SampleClock,
        NI_AI_SampleClockTimebase,
        NI_AI_StartTrigger,
        NI_AI_ReferenceTrigger,
        NI_AI_ConvertClock,
        NI_AI_ConvertClockTimebase,
        NI_AI_PauseTrigger,
        NI_AI_HoldCompleteEvent,
        NI_AI_HoldComplete,
        NI_AI_ExternalMUXClock,
        NI_AI_STOP, /* pulse signal that occurs when a update is finished(?) */
        NI_AO_SampleClock,
        NI_AO_SampleClockTimebase,
        NI_AO_StartTrigger,
        NI_AO_PauseTrigger,
        NI_DI_SampleClock,
        NI_DI_SampleClockTimebase,
        NI_DI_StartTrigger,
        NI_DI_ReferenceTrigger,
        NI_DI_PauseTrigger,
        NI_DI_InputBufferFull,
        NI_DI_ReadyForStartEvent,
        NI_DI_ReadyForTransferEventBurst,
        NI_DI_ReadyForTransferEventPipelined,
        NI_DO_SampleClock,
        NI_DO_SampleClockTimebase,
        NI_DO_StartTrigger,
        NI_DO_PauseTrigger,
        NI_DO_OutputBufferFull,
        NI_DO_DataActiveEvent,
        NI_DO_ReadyForStartEvent,
        NI_DO_ReadyForTransferEvent,
        NI_MasterTimebase,
        NI_20MHzTimebase,
        NI_80MHzTimebase,
        NI_100MHzTimebase,
        NI_200MHzTimebase,
        NI_100kHzTimebase,
        NI_10MHzRefClock,
        NI_FrequencyOutput,
        NI_ChangeDetectionEvent,
        NI_AnalogComparisonEvent,
        NI_WatchdogExpiredEvent,
        NI_WatchdogExpirationTrigger,
        NI_SCXI_Trig1,
        NI_LogicLow,
        NI_LogicHigh,
        NI_ExternalStrobe,
        NI_PFI_DO,
        NI_CaseGround,
        /* special internal signal used as variable source for RTSI bus: */
        NI_RGOUT0,

        /* just a name to make the next more convenient, regardless of above */
        _NI_NAMES_MAX_PLUS_1,
        NI_NUM_NAMES = _NI_NAMES_MAX_PLUS_1 - NI_NAMES_BASE,
};

/* *** END GLOBALLY-NAMED NI TERMINALS/SIGNALS *** */

#define NI_USUAL_PFI_SELECT(x)  (((x) < 10) ? (0x1 + (x)) : (0xb + (x)))
#define NI_USUAL_RTSI_SELECT(x) (((x) < 7) ? (0xb + (x)) : 0x1b)

/*
 * mode bits for NI general-purpose counters, set with
 * INSN_CONFIG_SET_COUNTER_MODE
 */
#define NI_GPCT_COUNTING_MODE_SHIFT 16
#define NI_GPCT_INDEX_PHASE_BITSHIFT 20
#define NI_GPCT_COUNTING_DIRECTION_SHIFT 24
enum ni_gpct_mode_bits {
        NI_GPCT_GATE_ON_BOTH_EDGES_BIT = 0x4,
        NI_GPCT_EDGE_GATE_MODE_MASK = 0x18,
        NI_GPCT_EDGE_GATE_STARTS_STOPS_BITS = 0x0,
        NI_GPCT_EDGE_GATE_STOPS_STARTS_BITS = 0x8,
        NI_GPCT_EDGE_GATE_STARTS_BITS = 0x10,
        NI_GPCT_EDGE_GATE_NO_STARTS_NO_STOPS_BITS = 0x18,
        NI_GPCT_STOP_MODE_MASK = 0x60,
        NI_GPCT_STOP_ON_GATE_BITS = 0x00,
        NI_GPCT_STOP_ON_GATE_OR_TC_BITS = 0x20,
        NI_GPCT_STOP_ON_GATE_OR_SECOND_TC_BITS = 0x40,
        NI_GPCT_LOAD_B_SELECT_BIT = 0x80,
        NI_GPCT_OUTPUT_MODE_MASK = 0x300,
        NI_GPCT_OUTPUT_TC_PULSE_BITS = 0x100,
        NI_GPCT_OUTPUT_TC_TOGGLE_BITS = 0x200,
        NI_GPCT_OUTPUT_TC_OR_GATE_TOGGLE_BITS = 0x300,
        NI_GPCT_HARDWARE_DISARM_MASK = 0xc00,
        NI_GPCT_NO_HARDWARE_DISARM_BITS = 0x000,
        NI_GPCT_DISARM_AT_TC_BITS = 0x400,
        NI_GPCT_DISARM_AT_GATE_BITS = 0x800,
        NI_GPCT_DISARM_AT_TC_OR_GATE_BITS = 0xc00,
        NI_GPCT_LOADING_ON_TC_BIT = 0x1000,
        NI_GPCT_LOADING_ON_GATE_BIT = 0x4000,
        NI_GPCT_COUNTING_MODE_MASK = 0x7 << NI_GPCT_COUNTING_MODE_SHIFT,
        NI_GPCT_COUNTING_MODE_NORMAL_BITS =
                0x0 << NI_GPCT_COUNTING_MODE_SHIFT,
        NI_GPCT_COUNTING_MODE_QUADRATURE_X1_BITS =
                0x1 << NI_GPCT_COUNTING_MODE_SHIFT,
        NI_GPCT_COUNTING_MODE_QUADRATURE_X2_BITS =
                0x2 << NI_GPCT_COUNTING_MODE_SHIFT,
        NI_GPCT_COUNTING_MODE_QUADRATURE_X4_BITS =
                0x3 << NI_GPCT_COUNTING_MODE_SHIFT,
        NI_GPCT_COUNTING_MODE_TWO_PULSE_BITS =
                0x4 << NI_GPCT_COUNTING_MODE_SHIFT,
        NI_GPCT_COUNTING_MODE_SYNC_SOURCE_BITS =
                0x6 << NI_GPCT_COUNTING_MODE_SHIFT,
        NI_GPCT_INDEX_PHASE_MASK = 0x3 << NI_GPCT_INDEX_PHASE_BITSHIFT,
        NI_GPCT_INDEX_PHASE_LOW_A_LOW_B_BITS =
                0x0 << NI_GPCT_INDEX_PHASE_BITSHIFT,
        NI_GPCT_INDEX_PHASE_LOW_A_HIGH_B_BITS =
                0x1 << NI_GPCT_INDEX_PHASE_BITSHIFT,
        NI_GPCT_INDEX_PHASE_HIGH_A_LOW_B_BITS =
                0x2 << NI_GPCT_INDEX_PHASE_BITSHIFT,
        NI_GPCT_INDEX_PHASE_HIGH_A_HIGH_B_BITS =
                0x3 << NI_GPCT_INDEX_PHASE_BITSHIFT,
        NI_GPCT_INDEX_ENABLE_BIT = 0x400000,
        NI_GPCT_COUNTING_DIRECTION_MASK =
                0x3 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
        NI_GPCT_COUNTING_DIRECTION_DOWN_BITS =
                0x00 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
        NI_GPCT_COUNTING_DIRECTION_UP_BITS =
                0x1 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
        NI_GPCT_COUNTING_DIRECTION_HW_UP_DOWN_BITS =
                0x2 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
        NI_GPCT_COUNTING_DIRECTION_HW_GATE_BITS =
                0x3 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
        NI_GPCT_RELOAD_SOURCE_MASK = 0xc000000,
        NI_GPCT_RELOAD_SOURCE_FIXED_BITS = 0x0,
        NI_GPCT_RELOAD_SOURCE_SWITCHING_BITS = 0x4000000,
        NI_GPCT_RELOAD_SOURCE_GATE_SELECT_BITS = 0x8000000,
        NI_GPCT_OR_GATE_BIT = 0x10000000,
        NI_GPCT_INVERT_OUTPUT_BIT = 0x20000000
};

/*
 * Bits for setting a clock source with
 * INSN_CONFIG_SET_CLOCK_SRC when using NI general-purpose counters.
 */
enum ni_gpct_clock_source_bits {
        NI_GPCT_CLOCK_SRC_SELECT_MASK = 0x3f,
        NI_GPCT_TIMEBASE_1_CLOCK_SRC_BITS = 0x0,
        NI_GPCT_TIMEBASE_2_CLOCK_SRC_BITS = 0x1,
        NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS = 0x2,
        NI_GPCT_LOGIC_LOW_CLOCK_SRC_BITS = 0x3,
        NI_GPCT_NEXT_GATE_CLOCK_SRC_BITS = 0x4,
        NI_GPCT_NEXT_TC_CLOCK_SRC_BITS = 0x5,
        /* NI 660x-specific */
        NI_GPCT_SOURCE_PIN_i_CLOCK_SRC_BITS = 0x6,
        NI_GPCT_PXI10_CLOCK_SRC_BITS = 0x7,
        NI_GPCT_PXI_STAR_TRIGGER_CLOCK_SRC_BITS = 0x8,
        NI_GPCT_ANALOG_TRIGGER_OUT_CLOCK_SRC_BITS = 0x9,
        NI_GPCT_PRESCALE_MODE_CLOCK_SRC_MASK = 0x30000000,
        NI_GPCT_NO_PRESCALE_CLOCK_SRC_BITS = 0x0,
        /* divide source by 2 */
        NI_GPCT_PRESCALE_X2_CLOCK_SRC_BITS = 0x10000000,
        /* divide source by 8 */
        NI_GPCT_PRESCALE_X8_CLOCK_SRC_BITS = 0x20000000,
        NI_GPCT_INVERT_CLOCK_SRC_BIT = 0x80000000
};

/* NI 660x-specific */
#define NI_GPCT_SOURCE_PIN_CLOCK_SRC_BITS(x)    (0x10 + (x))

#define NI_GPCT_RTSI_CLOCK_SRC_BITS(x)          (0x18 + (x))

/* no pfi on NI 660x */
#define NI_GPCT_PFI_CLOCK_SRC_BITS(x)           (0x20 + (x))

/*
 * Possibilities for setting a gate source with
 * INSN_CONFIG_SET_GATE_SRC when using NI general-purpose counters.
 * May be bitwise-or'd with CR_EDGE or CR_INVERT.
 */
enum ni_gpct_gate_select {
        /* m-series gates */
        NI_GPCT_TIMESTAMP_MUX_GATE_SELECT = 0x0,
        NI_GPCT_AI_START2_GATE_SELECT = 0x12,
        NI_GPCT_PXI_STAR_TRIGGER_GATE_SELECT = 0x13,
        NI_GPCT_NEXT_OUT_GATE_SELECT = 0x14,
        NI_GPCT_AI_START1_GATE_SELECT = 0x1c,
        NI_GPCT_NEXT_SOURCE_GATE_SELECT = 0x1d,
        NI_GPCT_ANALOG_TRIGGER_OUT_GATE_SELECT = 0x1e,
        NI_GPCT_LOGIC_LOW_GATE_SELECT = 0x1f,
        /* more gates for 660x */
        NI_GPCT_SOURCE_PIN_i_GATE_SELECT = 0x100,
        NI_GPCT_GATE_PIN_i_GATE_SELECT = 0x101,
        /* more gates for 660x "second gate" */
        NI_GPCT_UP_DOWN_PIN_i_GATE_SELECT = 0x201,
        NI_GPCT_SELECTED_GATE_GATE_SELECT = 0x21e,
        /*
         * m-series "second gate" sources are unknown,
         * we should add them here with an offset of 0x300 when
         * known.
         */
        NI_GPCT_DISABLED_GATE_SELECT = 0x8000,
};

#define NI_GPCT_GATE_PIN_GATE_SELECT(x)         (0x102 + (x))
#define NI_GPCT_RTSI_GATE_SELECT(x)             NI_USUAL_RTSI_SELECT(x)
#define NI_GPCT_PFI_GATE_SELECT(x)              NI_USUAL_PFI_SELECT(x)
#define NI_GPCT_UP_DOWN_PIN_GATE_SELECT(x)      (0x202 + (x))

/*
 * Possibilities for setting a source with
 * INSN_CONFIG_SET_OTHER_SRC when using NI general-purpose counters.
 */
enum ni_gpct_other_index {
        NI_GPCT_SOURCE_ENCODER_A,
        NI_GPCT_SOURCE_ENCODER_B,
        NI_GPCT_SOURCE_ENCODER_Z
};

enum ni_gpct_other_select {
        /* m-series gates */
        /* Still unknown, probably only need NI_GPCT_PFI_OTHER_SELECT */
        NI_GPCT_DISABLED_OTHER_SELECT = 0x8000,
};

#define NI_GPCT_PFI_OTHER_SELECT(x)     NI_USUAL_PFI_SELECT(x)

/*
 * start sources for ni general-purpose counters for use with
 * INSN_CONFIG_ARM
 */
enum ni_gpct_arm_source {
        NI_GPCT_ARM_IMMEDIATE = 0x0,
        /*
         * Start both the counter and the adjacent paired counter simultaneously
         */
        NI_GPCT_ARM_PAIRED_IMMEDIATE = 0x1,
        /*
         * If the NI_GPCT_HW_ARM bit is set, we will pass the least significant
         * bits (3 bits for 660x or 5 bits for m-series) through to the
         * hardware. To select a hardware trigger, pass the appropriate select
         * bit, e.g.,
         * NI_GPCT_HW_ARM | NI_GPCT_AI_START1_GATE_SELECT or
         * NI_GPCT_HW_ARM | NI_GPCT_PFI_GATE_SELECT(pfi_number)
         */
        NI_GPCT_HW_ARM = 0x1000,
        NI_GPCT_ARM_UNKNOWN = NI_GPCT_HW_ARM,   /* for backward compatibility */
};

/* digital filtering options for ni 660x for use with INSN_CONFIG_FILTER. */
enum ni_gpct_filter_select {
        NI_GPCT_FILTER_OFF = 0x0,
        NI_GPCT_FILTER_TIMEBASE_3_SYNC = 0x1,
        NI_GPCT_FILTER_100x_TIMEBASE_1 = 0x2,
        NI_GPCT_FILTER_20x_TIMEBASE_1 = 0x3,
        NI_GPCT_FILTER_10x_TIMEBASE_1 = 0x4,
        NI_GPCT_FILTER_2x_TIMEBASE_1 = 0x5,
        NI_GPCT_FILTER_2x_TIMEBASE_3 = 0x6
};

/*
 * PFI digital filtering options for ni m-series for use with
 * INSN_CONFIG_FILTER.
 */
enum ni_pfi_filter_select {
        NI_PFI_FILTER_OFF = 0x0,
        NI_PFI_FILTER_125ns = 0x1,
        NI_PFI_FILTER_6425ns = 0x2,
        NI_PFI_FILTER_2550us = 0x3
};

/* master clock sources for ni mio boards and INSN_CONFIG_SET_CLOCK_SRC */
enum ni_mio_clock_source {
        NI_MIO_INTERNAL_CLOCK = 0,
        /*
         * Doesn't work for m-series, use NI_MIO_PLL_RTSI_CLOCK()
         * the NI_MIO_PLL_* sources are m-series only
         */
        NI_MIO_RTSI_CLOCK = 1,
        NI_MIO_PLL_PXI_STAR_TRIGGER_CLOCK = 2,
        NI_MIO_PLL_PXI10_CLOCK = 3,
        NI_MIO_PLL_RTSI0_CLOCK = 4
};

#define NI_MIO_PLL_RTSI_CLOCK(x)        (NI_MIO_PLL_RTSI0_CLOCK + (x))

/*
 * Signals which can be routed to an NI RTSI pin with INSN_CONFIG_SET_ROUTING.
 * The numbers assigned are not arbitrary, they correspond to the bits required
 * to program the board.
 */
enum ni_rtsi_routing {
        NI_RTSI_OUTPUT_ADR_START1 = 0,
        NI_RTSI_OUTPUT_ADR_START2 = 1,
        NI_RTSI_OUTPUT_SCLKG = 2,
        NI_RTSI_OUTPUT_DACUPDN = 3,
        NI_RTSI_OUTPUT_DA_START1 = 4,
        NI_RTSI_OUTPUT_G_SRC0 = 5,
        NI_RTSI_OUTPUT_G_GATE0 = 6,
        NI_RTSI_OUTPUT_RGOUT0 = 7,
        NI_RTSI_OUTPUT_RTSI_BRD_0 = 8,
        /* Pre-m-series always have RTSI clock on line 7 */
        NI_RTSI_OUTPUT_RTSI_OSC = 12
};

#define NI_RTSI_OUTPUT_RTSI_BRD(x)      (NI_RTSI_OUTPUT_RTSI_BRD_0 + (x))

/*
 * Signals which can be routed to an NI PFI pin on an m-series board with
 * INSN_CONFIG_SET_ROUTING.  These numbers are also returned by
 * INSN_CONFIG_GET_ROUTING on pre-m-series boards, even though their routing
 * cannot be changed.  The numbers assigned are not arbitrary, they correspond
 * to the bits required to program the board.
 */
enum ni_pfi_routing {
        NI_PFI_OUTPUT_PFI_DEFAULT = 0,
        NI_PFI_OUTPUT_AI_START1 = 1,
        NI_PFI_OUTPUT_AI_START2 = 2,
        NI_PFI_OUTPUT_AI_CONVERT = 3,
        NI_PFI_OUTPUT_G_SRC1 = 4,
        NI_PFI_OUTPUT_G_GATE1 = 5,
        NI_PFI_OUTPUT_AO_UPDATE_N = 6,
        NI_PFI_OUTPUT_AO_START1 = 7,
        NI_PFI_OUTPUT_AI_START_PULSE = 8,
        NI_PFI_OUTPUT_G_SRC0 = 9,
        NI_PFI_OUTPUT_G_GATE0 = 10,
        NI_PFI_OUTPUT_EXT_STROBE = 11,
        NI_PFI_OUTPUT_AI_EXT_MUX_CLK = 12,
        NI_PFI_OUTPUT_GOUT0 = 13,
        NI_PFI_OUTPUT_GOUT1 = 14,
        NI_PFI_OUTPUT_FREQ_OUT = 15,
        NI_PFI_OUTPUT_PFI_DO = 16,
        NI_PFI_OUTPUT_I_ATRIG = 17,
        NI_PFI_OUTPUT_RTSI0 = 18,
        NI_PFI_OUTPUT_PXI_STAR_TRIGGER_IN = 26,
        NI_PFI_OUTPUT_SCXI_TRIG1 = 27,
        NI_PFI_OUTPUT_DIO_CHANGE_DETECT_RTSI = 28,
        NI_PFI_OUTPUT_CDI_SAMPLE = 29,
        NI_PFI_OUTPUT_CDO_UPDATE = 30
};

#define NI_PFI_OUTPUT_RTSI(x)           (NI_PFI_OUTPUT_RTSI0 + (x))

/*
 * Signals which can be routed to output on a NI PFI pin on a 660x board
 * with INSN_CONFIG_SET_ROUTING.  The numbers assigned are
 * not arbitrary, they correspond to the bits required
 * to program the board.  Lines 0 to 7 can only be set to
 * NI_660X_PFI_OUTPUT_DIO.  Lines 32 to 39 can only be set to
 * NI_660X_PFI_OUTPUT_COUNTER.
 */
enum ni_660x_pfi_routing {
        NI_660X_PFI_OUTPUT_COUNTER = 1, /* counter */
        NI_660X_PFI_OUTPUT_DIO = 2,     /* static digital output */
};

/*
 * NI External Trigger lines.  These values are not arbitrary, but are related
 * to the bits required to program the board (offset by 1 for historical
 * reasons).
 */
#define NI_EXT_PFI(x)                   (NI_USUAL_PFI_SELECT(x) - 1)
#define NI_EXT_RTSI(x)                  (NI_USUAL_RTSI_SELECT(x) - 1)

/*
 * Clock sources for CDIO subdevice on NI m-series boards.  Used as the
 * scan_begin_arg for a comedi_command. These sources may also be bitwise-or'd
 * with CR_INVERT to change polarity.
 */
enum ni_m_series_cdio_scan_begin_src {
        NI_CDIO_SCAN_BEGIN_SRC_GROUND = 0,
        NI_CDIO_SCAN_BEGIN_SRC_AI_START = 18,
        NI_CDIO_SCAN_BEGIN_SRC_AI_CONVERT = 19,
        NI_CDIO_SCAN_BEGIN_SRC_PXI_STAR_TRIGGER = 20,
        NI_CDIO_SCAN_BEGIN_SRC_G0_OUT = 28,
        NI_CDIO_SCAN_BEGIN_SRC_G1_OUT = 29,
        NI_CDIO_SCAN_BEGIN_SRC_ANALOG_TRIGGER = 30,
        NI_CDIO_SCAN_BEGIN_SRC_AO_UPDATE = 31,
        NI_CDIO_SCAN_BEGIN_SRC_FREQ_OUT = 32,
        NI_CDIO_SCAN_BEGIN_SRC_DIO_CHANGE_DETECT_IRQ = 33
};

#define NI_CDIO_SCAN_BEGIN_SRC_PFI(x)   NI_USUAL_PFI_SELECT(x)
#define NI_CDIO_SCAN_BEGIN_SRC_RTSI(x)  NI_USUAL_RTSI_SELECT(x)

/*
 * scan_begin_src for scan_begin_arg==TRIG_EXT with analog output command on NI
 * boards.  These scan begin sources can also be bitwise-or'd with CR_INVERT to
 * change polarity.
 */
#define NI_AO_SCAN_BEGIN_SRC_PFI(x)     NI_USUAL_PFI_SELECT(x)
#define NI_AO_SCAN_BEGIN_SRC_RTSI(x)    NI_USUAL_RTSI_SELECT(x)

/*
 * Bits for setting a clock source with
 * INSN_CONFIG_SET_CLOCK_SRC when using NI frequency output subdevice.
 */
enum ni_freq_out_clock_source_bits {
        NI_FREQ_OUT_TIMEBASE_1_DIV_2_CLOCK_SRC, /* 10 MHz */
        NI_FREQ_OUT_TIMEBASE_2_CLOCK_SRC        /* 100 KHz */
};

/*
 * Values for setting a clock source with INSN_CONFIG_SET_CLOCK_SRC for
 * 8254 counter subdevices on Amplicon DIO boards (amplc_dio200 driver).
 */
enum amplc_dio_clock_source {
        /*
         * Per channel external clock
         * input/output pin (pin is only an
         * input when clock source set to this value,
         * otherwise it is an output)
         */
        AMPLC_DIO_CLK_CLKN,
        AMPLC_DIO_CLK_10MHZ,    /* 10 MHz internal clock */
        AMPLC_DIO_CLK_1MHZ,     /* 1 MHz internal clock */
        AMPLC_DIO_CLK_100KHZ,   /* 100 kHz internal clock */
        AMPLC_DIO_CLK_10KHZ,    /* 10 kHz internal clock */
        AMPLC_DIO_CLK_1KHZ,     /* 1 kHz internal clock */
        /*
         * Output of preceding counter channel
         * (for channel 0, preceding counter
         * channel is channel 2 on preceding
         * counter subdevice, for first counter
         * subdevice, preceding counter
         * subdevice is the last counter
         * subdevice)
         */
        AMPLC_DIO_CLK_OUTNM1,
        AMPLC_DIO_CLK_EXT,      /* per chip external input pin */
        /* the following are "enhanced" clock sources for PCIe models */
        AMPLC_DIO_CLK_VCC,      /* clock input HIGH */
        AMPLC_DIO_CLK_GND,      /* clock input LOW */
        AMPLC_DIO_CLK_PAT_PRESENT, /* "pattern present" signal */
        AMPLC_DIO_CLK_20MHZ     /* 20 MHz internal clock */
};

/*
 * Values for setting a clock source with INSN_CONFIG_SET_CLOCK_SRC for
 * timer subdevice on some Amplicon DIO PCIe boards (amplc_dio200 driver).
 */
enum amplc_dio_ts_clock_src {
        AMPLC_DIO_TS_CLK_1GHZ,  /* 1 ns period with 20 ns granularity */
        AMPLC_DIO_TS_CLK_1MHZ,  /* 1 us period */
        AMPLC_DIO_TS_CLK_1KHZ   /* 1 ms period */
};

/*
 * Values for setting a gate source with INSN_CONFIG_SET_GATE_SRC for
 * 8254 counter subdevices on Amplicon DIO boards (amplc_dio200 driver).
 */
enum amplc_dio_gate_source {
        AMPLC_DIO_GAT_VCC,      /* internal high logic level */
        AMPLC_DIO_GAT_GND,      /* internal low logic level */
        AMPLC_DIO_GAT_GATN,     /* per channel external gate input */
        /*
         * negated output of counter channel minus 2
         * (for channels 0 or 1, channel minus 2 is channel 1 or 2 on
         * the preceding counter subdevice, for the first counter subdevice
         * the preceding counter subdevice is the last counter subdevice)
         */
        AMPLC_DIO_GAT_NOUTNM2,
        AMPLC_DIO_GAT_RESERVED4,
        AMPLC_DIO_GAT_RESERVED5,
        AMPLC_DIO_GAT_RESERVED6,
        AMPLC_DIO_GAT_RESERVED7,
        /* the following are "enhanced" gate sources for PCIe models */
        AMPLC_DIO_GAT_NGATN = 6, /* negated per channel gate input */
        /* non-negated output of counter channel minus 2 */
        AMPLC_DIO_GAT_OUTNM2,
        AMPLC_DIO_GAT_PAT_PRESENT, /* "pattern present" signal */
        AMPLC_DIO_GAT_PAT_OCCURRED, /* "pattern occurred" latched */
        AMPLC_DIO_GAT_PAT_GONE, /* "pattern gone away" latched */
        AMPLC_DIO_GAT_NPAT_PRESENT, /* negated "pattern present" */
        AMPLC_DIO_GAT_NPAT_OCCURRED, /* negated "pattern occurred" */
        AMPLC_DIO_GAT_NPAT_GONE /* negated "pattern gone away" */
};

/*
 * Values for setting a clock source with INSN_CONFIG_SET_CLOCK_SRC for
 * the counter subdevice on the Kolter Electronic PCI-Counter board
 * (ke_counter driver).
 */
enum ke_counter_clock_source {
        KE_CLK_20MHZ,   /* internal 20MHz (default) */
        KE_CLK_4MHZ,    /* internal 4MHz (option) */
        KE_CLK_EXT      /* external clock on pin 21 of D-Sub */
};

#endif /* _COMEDI_H */