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 /* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
 /*
  * 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 */

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