libsigrok/libsigrok.h

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef LIBSIGROK_LIBSIGROK_H
#define LIBSIGROK_LIBSIGROK_H

#include <stdio.h>
#include <sys/time.h>
#include <stdint.h>
#include <inttypes.h>
#include <glib.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @file
 *
 * The public libsigrok header file to be used by frontends.
 *
 * This is the only file that libsigrok users (frontends) are supposed to
 * use and \#include. There are other header files which get installed with
 * libsigrok, but those are not meant to be used directly by frontends.
 *
 * The correct way to get/use the libsigrok API functions is:
 *
   @code{.c}
     #include <libsigrok/libsigrok.h>
   @endcode
 */

/*
 * All possible return codes of libsigrok functions must be listed here.
 * Functions should never return hardcoded numbers as status, but rather
 * use these enum values. All error codes are negative numbers.
 *
 * The error codes are globally unique in libsigrok, i.e. if one of the
 * libsigrok functions returns a "malloc error" it must be exactly the same
 * return value as used by all other functions to indicate "malloc error".
 * There must be no functions which indicate two different errors via the
 * same return code.
 *
 * Also, for compatibility reasons, no defined return codes are ever removed
 * or reused for different errors later. You can only add new entries and
 * return codes, but never remove or redefine existing ones.
 */

/** Status/error codes returned by libsigrok functions. */
enum {
	SR_OK                =  0, /**< No error. */
	SR_ERR               = -1, /**< Generic/unspecified error. */
	SR_ERR_MALLOC        = -2, /**< Malloc/calloc/realloc error. */
	SR_ERR_ARG           = -3, /**< Function argument error. */
	SR_ERR_BUG           = -4, /**< Errors hinting at internal bugs. */
	SR_ERR_SAMPLERATE    = -5, /**< Incorrect samplerate. */
	SR_ERR_NA            = -6, /**< Not applicable. */
	SR_ERR_DEV_CLOSED    = -7, /**< Device is closed, but must be open. */
	SR_ERR_TIMEOUT       = -8, /**< A timeout occurred. */
	SR_ERR_CHANNEL_GROUP = -9, /**< A channel group must be specified. */

	/*
	 * Note: When adding entries here, don't forget to also update the
	 * sr_strerror() and sr_strerror_name() functions in error.c.
	 */
};

#define SR_MAX_CHANNELNAME_LEN 32

/* Handy little macros */
#define SR_HZ(n)  (n)
#define SR_KHZ(n) ((n) * (uint64_t)(1000ULL))
#define SR_MHZ(n) ((n) * (uint64_t)(1000000ULL))
#define SR_GHZ(n) ((n) * (uint64_t)(1000000000ULL))

#define SR_HZ_TO_NS(n) ((uint64_t)(1000000000ULL) / (n))

/** libsigrok loglevels. */
enum sr_loglevel {
	SR_LOG_NONE = 0, /**< Output no messages at all. */
	SR_LOG_ERR  = 1, /**< Output error messages. */
	SR_LOG_WARN = 2, /**< Output warnings. */
	SR_LOG_INFO = 3, /**< Output informational messages. */
	SR_LOG_DBG  = 4, /**< Output debug messages. */
	SR_LOG_SPEW = 5, /**< Output very noisy debug messages. */
};

/*
 * Use SR_API to mark public API symbols, and SR_PRIV for private symbols.
 *
 * Variables and functions marked 'static' are private already and don't
 * need SR_PRIV. However, functions which are not static (because they need
 * to be used in other libsigrok-internal files) but are also not meant to
 * be part of the public libsigrok API, must use SR_PRIV.
 *
 * This uses the 'visibility' feature of gcc (requires gcc >= 4.0).
 *
 * This feature is not available on MinGW/Windows, as it is a feature of
 * ELF files and MinGW/Windows uses PE files.
 *
 * Details: http://gcc.gnu.org/wiki/Visibility
 */

/* Marks public libsigrok API symbols. */
#ifndef _WIN32
#define SR_API __attribute__((visibility("default")))
#else
#define SR_API
#endif

/* Marks private, non-public libsigrok symbols (not part of the API). */
#ifndef _WIN32
#define SR_PRIV __attribute__((visibility("hidden")))
#else
#define SR_PRIV
#endif

/** Type definition for callback function for data reception. */
typedef int (*sr_receive_data_callback_t)(int fd, int revents, void *cb_data);

/** Data types used by sr_config_info(). */
enum sr_datatype {
	SR_T_UINT64 = 10000,
	SR_T_CHAR,
	SR_T_BOOL,
	SR_T_FLOAT,
	SR_T_RATIONAL_PERIOD,
	SR_T_RATIONAL_VOLT,
	SR_T_KEYVALUE,
	SR_T_UINT64_RANGE,
	SR_T_DOUBLE_RANGE,
	SR_T_INT32,
};

/** Value for sr_datafeed_packet.type. */
enum sr_packettype {
	/** Payload is sr_datafeed_header. */
	SR_DF_HEADER = 10000,
	/** End of stream (no further data). */
	SR_DF_END,
	/** Payload is struct sr_datafeed_meta */
	SR_DF_META,
	/** The trigger matched at this point in the data feed. No payload. */
	SR_DF_TRIGGER,
	/** Payload is struct sr_datafeed_logic. */
	SR_DF_LOGIC,
	/** Payload is struct sr_datafeed_analog. */
	SR_DF_ANALOG,
	/** Beginning of frame. No payload. */
	SR_DF_FRAME_BEGIN,
	/** End of frame. No payload. */
	SR_DF_FRAME_END,
};

/** Measured quantity, sr_datafeed_analog.mq. */
enum sr_mq {
	SR_MQ_VOLTAGE = 10000,
	SR_MQ_CURRENT,
	SR_MQ_RESISTANCE,
	SR_MQ_CAPACITANCE,
	SR_MQ_TEMPERATURE,
	SR_MQ_FREQUENCY,
	/** Duty cycle, e.g. on/off ratio. */
	SR_MQ_DUTY_CYCLE,
	/** Continuity test. */
	SR_MQ_CONTINUITY,
	SR_MQ_PULSE_WIDTH,
	SR_MQ_CONDUCTANCE,
	/** Electrical power, usually in W, or dBm. */
	SR_MQ_POWER,
	/** Gain (a transistor's gain, or hFE, for example). */
	SR_MQ_GAIN,
	/** Logarithmic representation of sound pressure relative to a
	 * reference value. */
	SR_MQ_SOUND_PRESSURE_LEVEL,
	/** Carbon monoxide level */
	SR_MQ_CARBON_MONOXIDE,
	/** Humidity */
	SR_MQ_RELATIVE_HUMIDITY,
	/** Time */
	SR_MQ_TIME,
};

/** Unit of measured quantity, sr_datafeed_analog.unit. */
enum sr_unit {
	/** Volt */
	SR_UNIT_VOLT = 10000,
	/** Ampere (current). */
	SR_UNIT_AMPERE,
	/** Ohm (resistance). */
	SR_UNIT_OHM,
	/** Farad (capacity). */
	SR_UNIT_FARAD,
	/** Kelvin (temperature). */
	SR_UNIT_KELVIN,
	/** Degrees Celsius (temperature). */
	SR_UNIT_CELSIUS,
	/** Degrees Fahrenheit (temperature). */
	SR_UNIT_FAHRENHEIT,
	/** Hertz (frequency, 1/s, [Hz]). */
	SR_UNIT_HERTZ,
	/** Percent value. */
	SR_UNIT_PERCENTAGE,
	/** Boolean value. */
	SR_UNIT_BOOLEAN,
	/** Time in seconds. */
	SR_UNIT_SECOND,
	/** Unit of conductance, the inverse of resistance. */
	SR_UNIT_SIEMENS,
	/**
	 * An absolute measurement of power, in decibels, referenced to
	 * 1 milliwatt (dBu).
	 */
	SR_UNIT_DECIBEL_MW,
	/** Voltage in decibel, referenced to 1 volt (dBV). */
	SR_UNIT_DECIBEL_VOLT,
	/**
	 * Measurements that intrinsically do not have units attached, such
	 * as ratios, gains, etc. Specifically, a transistor's gain (hFE) is
	 * a unitless quantity, for example.
	 */
	SR_UNIT_UNITLESS,
	/** Sound pressure level relative so 20 micropascals. */
	SR_UNIT_DECIBEL_SPL,
	/**
	 * Normalized (0 to 1) concentration of a substance or compound with 0
	 * representing a concentration of 0%, and 1 being 100%. This is
	 * represented as the fraction of number of particles of the substance.
	 */
	SR_UNIT_CONCENTRATION,
	/** Revolutions per minute. */
	SR_UNIT_REVOLUTIONS_PER_MINUTE,
	/** Apparent power [VA]. */
	SR_UNIT_VOLT_AMPERE,
	/** Real power [W]. */
	SR_UNIT_WATT,
	/** Consumption [Wh]. */
	SR_UNIT_WATT_HOUR,
};

/** Values for sr_datafeed_analog.flags. */
enum sr_mqflag {
	/** Voltage measurement is alternating current (AC). */
	SR_MQFLAG_AC = 0x01,
	/** Voltage measurement is direct current (DC). */
	SR_MQFLAG_DC = 0x02,
	/** This is a true RMS measurement. */
	SR_MQFLAG_RMS = 0x04,
	/** Value is voltage drop across a diode, or NAN. */
	SR_MQFLAG_DIODE = 0x08,
	/** Device is in "hold" mode (repeating the last measurement). */
	SR_MQFLAG_HOLD = 0x10,
	/** Device is in "max" mode, only updating upon a new max value. */
	SR_MQFLAG_MAX = 0x20,
	/** Device is in "min" mode, only updating upon a new min value. */
	SR_MQFLAG_MIN = 0x40,
	/** Device is in autoranging mode. */
	SR_MQFLAG_AUTORANGE = 0x80,
	/** Device is in relative mode. */
	SR_MQFLAG_RELATIVE = 0x100,
	/** Sound pressure level is A-weighted in the frequency domain,
	 * according to IEC 61672:2003. */
	SR_MQFLAG_SPL_FREQ_WEIGHT_A = 0x200,
	/** Sound pressure level is C-weighted in the frequency domain,
	 * according to IEC 61672:2003. */
	SR_MQFLAG_SPL_FREQ_WEIGHT_C = 0x400,
	/** Sound pressure level is Z-weighted (i.e. not at all) in the
	 * frequency domain, according to IEC 61672:2003. */
	SR_MQFLAG_SPL_FREQ_WEIGHT_Z = 0x800,
	/** Sound pressure level is not weighted in the frequency domain,
	 * albeit without standards-defined low and high frequency limits. */
	SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT = 0x1000,
	/** Sound pressure level measurement is S-weighted (1s) in the
	 * time domain. */
	SR_MQFLAG_SPL_TIME_WEIGHT_S = 0x2000,
	/** Sound pressure level measurement is F-weighted (125ms) in the
	 * time domain. */
	SR_MQFLAG_SPL_TIME_WEIGHT_F = 0x4000,
	/** Sound pressure level is time-averaged (LAT), also known as
	 * Equivalent Continuous A-weighted Sound Level (LEQ). */
	SR_MQFLAG_SPL_LAT = 0x8000,
	/** Sound pressure level represented as a percentage of measurements
	 * that were over a preset alarm level. */
	SR_MQFLAG_SPL_PCT_OVER_ALARM = 0x10000,
	/** Time is duration (as opposed to epoch, ...). */
	SR_MQFLAG_DURATION = 0x20000,
	/** Device is in "avg" mode, averaging upon each new value. */
	SR_MQFLAG_AVG = 0x40000,
};

/**
 * @struct sr_context
 * Opaque structure representing a libsigrok context.
 *
 * None of the fields of this structure are meant to be accessed directly.
 *
 * @see sr_init(), sr_exit().
 */
struct sr_context;

/** Packet in a sigrok data feed. */
struct sr_datafeed_packet {
	uint16_t type;
	const void *payload;
};

/** Header of a sigrok data feed. */
struct sr_datafeed_header {
	int feed_version;
	struct timeval starttime;
};

/** Datafeed payload for type SR_DF_META. */
struct sr_datafeed_meta {
	GSList *config;
};

/** Logic datafeed payload for type SR_DF_LOGIC. */
struct sr_datafeed_logic {
	uint64_t length;
	uint16_t unitsize;
	void *data;
};

/** Analog datafeed payload for type SR_DF_ANALOG. */
struct sr_datafeed_analog {
	/** The channels for which data is included in this packet. */
	GSList *channels;
	/** Number of samples in data */
	int num_samples;
	/** Measured quantity (voltage, current, temperature, and so on).
	 *  Use SR_MQ_VOLTAGE, ... */
	int mq;
	/** Unit in which the MQ is measured. Use SR_UNIT_VOLT, ... */
	int unit;
	/** Bitmap with extra information about the MQ. Use SR_MQFLAG_AC, ... */
	uint64_t mqflags;
	/** The analog value(s). The data is interleaved according to
	 * the channels list. */
	float *data;
};

/** Input (file) format struct. */
struct sr_input {
	/**
	 * A pointer to this input format's 'struct sr_input_format'.
	 * The frontend can use this to call the module's callbacks.
	 */
	struct sr_input_format *format;

	GHashTable *param;

	struct sr_dev_inst *sdi;

	void *internal;
};

/** Input (file) format driver. */
struct sr_input_format {
	/** The unique ID for this input format. Must not be NULL. */
	char *id;

	/**
	 * A short description of the input format, which can (for example)
	 * be displayed to the user by frontends. Must not be NULL.
	 */
	char *description;

	/**
	 * Check if this input module can load and parse the specified file.
	 *
	 * @param[in] filename The name (and path) of the file to check.
	 *
	 * @retval TRUE This module knows the format.
	 * @retval FALSE This module does not know the format.
	 */
	int (*format_match) (const char *filename);

	/**
	 * Initialize the input module.
	 *
	 * @param in A pointer to a valid 'struct sr_input' that the caller
	 *           has to allocate and provide to this function. It is also
	 *           the responsibility of the caller to free it later.
	 * @param[in] filename The name (and path) of the file to use.
	 *
	 * @retval SR_OK Success
	 * @retval other Negative error code.
	 */
	int (*init) (struct sr_input *in, const char *filename);

	/**
	 * Load a file, parsing the input according to the file's format.
	 *
	 * This function will send datafeed packets to the session bus, so
	 * the calling frontend must have registered its session callbacks
	 * beforehand.
	 *
	 * The packet types sent across the session bus by this function must
	 * include at least SR_DF_HEADER, SR_DF_END, and an appropriate data
	 * type such as SR_DF_LOGIC. It may also send a SR_DF_TRIGGER packet
	 * if appropriate.
	 *
	 * @param in A pointer to a valid 'struct sr_input' that the caller
	 *           has to allocate and provide to this function. It is also
	 *           the responsibility of the caller to free it later.
	 * @param filename The name (and path) of the file to use.
	 *
	 * @retval SR_OK Success
	 * @retval other Negative error code.
	 */
	int (*loadfile) (struct sr_input *in, const char *filename);
};

/** Output (file) format struct. */
struct sr_output {
	/** A pointer to this output's format.  */
	struct sr_output_format *format;

	/**
	 * The device for which this output module is creating output. This
	 * can be used by the module to find out channel names and numbers.
	 */
	const struct sr_dev_inst *sdi;

	/**
	 * An optional parameter which the frontend can pass in to the
	 * output module. How the string is interpreted is entirely up to
	 * the module.
	 */
	GHashTable *params;

	/**
	 * A generic pointer which can be used by the module to keep internal
	 * state between calls into its callback functions.
	 *
	 * For example, the module might store a pointer to a chunk of output
	 * there, and only flush it when it reaches a certain size.
	 */
	void *internal;
};

/** Output (file) format driver. */
struct sr_output_format {
	/**
	 * A unique ID for this output format. Must not be NULL.
	 *
	 * It can be used by frontends to select this output format for use.
	 *
	 * For example, calling sigrok-cli with <code>-O hex</code> will
	 * select the hexadecimal text output format.
	 */
	char *id;

	/**
	 * A short description of the output format. Must not be NULL.
	 *
	 * This can be displayed by frontends, e.g. when selecting the output
	 * format for saving a file.
	 */
	char *description;

	/**
	 * This function is called once, at the beginning of an output stream.
	 *
	 * The device struct will be available in the output struct passed in,
	 * as well as the param field -- which may be NULL or an empty string,
	 * if no parameter was passed.
	 *
	 * The module can use this to initialize itself, create a struct for
	 * keeping state and storing it in the <code>internal</code> field.
	 *
	 * @param o Pointer to the respective 'struct sr_output'.
	 *
	 * @retval SR_OK Success
	 * @retval other Negative error code.
	 */
	int (*init) (struct sr_output *o);

	/**
	 * This function is passed a copy of every packed in the data feed.
	 * Any output generated by the output module in response to the
	 * packet should be returned in a newly allocated GString
	 * <code>out</code>, which will be freed by the caller.
	 *
	 * Packets not of interest to the output module can just be ignored,
	 * and the <code>out</code> parameter set to NULL.
	 *
	 * @param o Pointer to the respective 'struct sr_output'.
	 * @param sdi The device instance that generated the packet.
	 * @param packet The complete packet.
	 * @param out A pointer where a GString * should be stored if
	 * the module generates output, or NULL if not.
	 *
	 * @retval SR_OK Success
	 * @retval other Negative error code.
	 */
	int (*receive) (struct sr_output *o,
			const struct sr_datafeed_packet *packet, GString **out);

	/**
	 * This function is called after the caller is finished using
	 * the output module, and can be used to free any internal
	 * resources the module may keep.
	 *
	 * @retval SR_OK Success
	 * @retval other Negative error code.
	 */
	int (*cleanup) (struct sr_output *o);
};

/** Constants for channel type. */
enum sr_channeltype {
	/** Channel type is logic channel. */
	SR_CHANNEL_LOGIC = 10000,
	/** Channel type is analog channel. */
	SR_CHANNEL_ANALOG,
};

/** Information on single channel. */
struct sr_channel {
	/** Number of channels, starting at 0. */
	int index;
	/** Channel type (SR_CHANNEL_LOGIC, ...) */
	int type;
	/** Is this channel enabled? */
	gboolean enabled;
	/** Name of channel. */
	char *name;
	/** Trigger string, format like used by sigrok-cli */
	char *trigger;
};

/** Structure for groups of channels that have common properties. */
struct sr_channel_group {
	/** Name of the channel group. */
	char *name;
	/** List of sr_channel structs of the channels belonging to this group. */
	GSList *channels;
	/** Private data for driver use. */
	void *priv;
};

/** Used for setting or getting value of a config item. */
struct sr_config {
	/** Config key like SR_CONF_CONN, etc. */
	int key;
	/** Key-specific data. */
	GVariant *data;
};

/** Information about a config key. */
struct sr_config_info {
	/** Config key like SR_CONF_CONN, etc. */
	int key;
	/** Data type like SR_T_CHAR, etc. */
	int datatype;
	/** Id string, e.g. "serialcomm". */
	char *id;
	/** Name, e.g. "Serial communication". */
	char *name;
	/** Verbose description (unused currently). */
	char *description;
};

/** Constants for device classes */
enum sr_configkey {
	/*--- Device classes ------------------------------------------------*/

	/** The device can act as logic analyzer. */
	SR_CONF_LOGIC_ANALYZER = 10000,

	/** The device can act as an oscilloscope. */
	SR_CONF_OSCILLOSCOPE,

	/** The device can act as a multimeter. */
	SR_CONF_MULTIMETER,

	/** The device is a demo device. */
	SR_CONF_DEMO_DEV,

	/** The device can act as a sound level meter. */
	SR_CONF_SOUNDLEVELMETER,

	/** The device can measure temperature. */
	SR_CONF_THERMOMETER,

	/** The device can measure humidity. */
	SR_CONF_HYGROMETER,

	/** The device can measure energy consumption. */
	SR_CONF_ENERGYMETER,

	/** The device can demodulate signals. */
	SR_CONF_DEMODULATOR,

	/** Programmable power supply. */
	SR_CONF_POWER_SUPPLY,

	/*--- Driver scan options -------------------------------------------*/

	/**
	 * Specification on how to connect to a device.
	 *
	 * In combination with SR_CONF_SERIALCOMM, this is a serial port in
	 * the form which makes sense to the OS (e.g., /dev/ttyS0).
	 * Otherwise this specifies a USB device, either in the form of
	 * @verbatim <bus>.<address> @endverbatim (decimal, e.g. 1.65) or
	 * @verbatim <vendorid>.<productid> @endverbatim
	 * (hexadecimal, e.g. 1d6b.0001).
	 */
	SR_CONF_CONN = 20000,

	/**
	 * Serial communication specification, in the form:
	 *
	 *   @verbatim <baudrate>/<databits><parity><stopbits> @endverbatim
	 *
	 * Example: 9600/8n1
	 *
	 * The string may also be followed by one or more special settings,
	 * in the form "/key=value". Supported keys and their values are:
	 *
	 * rts    0,1    set the port's RTS pin to low or high
	 * dtr    0,1    set the port's DTR pin to low or high
	 * flow   0      no flow control
	 *        1      hardware-based (RTS/CTS) flow control
	 *        2      software-based (XON/XOFF) flow control
	 *
	 * This is always an optional parameter, since a driver typically
	 * knows the speed at which the device wants to communicate.
	 */
	SR_CONF_SERIALCOMM,

	/*--- Device configuration ------------------------------------------*/

	/** The device supports setting its samplerate, in Hz. */
	SR_CONF_SAMPLERATE = 30000,

	/** The device supports setting a pre/post-trigger capture ratio. */
	SR_CONF_CAPTURE_RATIO,

	/** The device supports setting a pattern (pattern generator mode). */
	SR_CONF_PATTERN_MODE,

	/** The device supports Run Length Encoding. */
	SR_CONF_RLE,

	/** The device supports setting trigger slope. */
	SR_CONF_TRIGGER_SLOPE,

	/** Trigger source. */
	SR_CONF_TRIGGER_SOURCE,

	/** Horizontal trigger position. */
	SR_CONF_HORIZ_TRIGGERPOS,

	/** Buffer size. */
	SR_CONF_BUFFERSIZE,

	/** Time base. */
	SR_CONF_TIMEBASE,

	/** Filter. */
	SR_CONF_FILTER,

	/** Volts/div. */
	SR_CONF_VDIV,

	/** Coupling. */
	SR_CONF_COUPLING,

	/** Trigger types.  */
	SR_CONF_TRIGGER_TYPE,

	/** The device supports setting its sample interval, in ms. */
	SR_CONF_SAMPLE_INTERVAL,

	/** Number of timebases, as related to SR_CONF_TIMEBASE.  */
	SR_CONF_NUM_TIMEBASE,

	/** Number of vertical divisions, as related to SR_CONF_VDIV.  */
	SR_CONF_NUM_VDIV,

	/** Sound pressure level frequency weighting.  */
	SR_CONF_SPL_WEIGHT_FREQ,

	/** Sound pressure level time weighting.  */
	SR_CONF_SPL_WEIGHT_TIME,

	/** Sound pressure level measurement range.  */
	SR_CONF_SPL_MEASUREMENT_RANGE,

	/** Max hold mode. */
	SR_CONF_HOLD_MAX,

	/** Min hold mode. */
	SR_CONF_HOLD_MIN,

	/** Logic low-high threshold range. */
	SR_CONF_VOLTAGE_THRESHOLD,

	/** The device supports using an external clock. */
	SR_CONF_EXTERNAL_CLOCK,

	/**
	 * The device supports swapping channels. Typical this is between
	 * buffered and unbuffered channels.
	 */
	SR_CONF_SWAP,

	/** Center frequency.
	 * The input signal is downmixed by this frequency before the ADC
	 * anti-aliasing filter.
	 */
	SR_CONF_CENTER_FREQUENCY,

	/** The device supports setting the number of logic channels. */
	SR_CONF_NUM_LOGIC_CHANNELS,

	/** The device supports setting the number of analog channels. */
	SR_CONF_NUM_ANALOG_CHANNELS,

	/** Output voltage. */
	SR_CONF_OUTPUT_VOLTAGE,

	/** Maximum output voltage. */
	SR_CONF_OUTPUT_VOLTAGE_MAX,

	/** Output current. */
	SR_CONF_OUTPUT_CURRENT,

	/** Maximum output current. */
	SR_CONF_OUTPUT_CURRENT_MAX,

	/** Enabling/disabling output. */
	SR_CONF_OUTPUT_ENABLED,

	/** Channel output configuration. */
	SR_CONF_OUTPUT_CHANNEL,

	/** Over-voltage protection (OVP) */
	SR_CONF_OVER_VOLTAGE_PROTECTION,

	/** Over-current protection (OCP) */
	SR_CONF_OVER_CURRENT_PROTECTION,

	/** Choice of clock edge for external clock ("r" or "f"). */
	SR_CONF_CLOCK_EDGE,

	/*--- Special stuff -------------------------------------------------*/

	/** Scan options supported by the driver. */
	SR_CONF_SCAN_OPTIONS = 40000,

	/** Device options for a particular device. */
	SR_CONF_DEVICE_OPTIONS,

	/** Session filename. */
	SR_CONF_SESSIONFILE,

	/** The device supports specifying a capturefile to inject. */
	SR_CONF_CAPTUREFILE,

	/** The device supports specifying the capturefile unit size. */
	SR_CONF_CAPTURE_UNITSIZE,

	/** Power off the device. */
	SR_CONF_POWER_OFF,

	/**
	 * Data source for acquisition. If not present, acquisition from
	 * the device is always "live", i.e. acquisition starts when the
	 * frontend asks and the results are sent out as soon as possible.
	 *
	 * If present, it indicates that either the device has no live
	 * acquisition capability (for example a pure data logger), or
	 * there is a choice. sr_config_list() returns those choices.
	 *
	 * In any case if a device has live acquisition capabilities, it
	 * is always the default.
	 */
	SR_CONF_DATA_SOURCE,

	/*--- Acquisition modes ---------------------------------------------*/

	/**
	 * The device supports setting a sample time limit (how long
	 * the sample acquisition should run, in ms).
	 */
	SR_CONF_LIMIT_MSEC = 50000,

	/**
	 * The device supports setting a sample number limit (how many
	 * samples should be acquired).
	 */
	SR_CONF_LIMIT_SAMPLES,

	/**
	 * The device supports setting a frame limit (how many
	 * frames should be acquired).
	 */
	SR_CONF_LIMIT_FRAMES,

	/**
	 * The device supports continuous sampling. Neither a time limit
	 * nor a sample number limit has to be supplied, it will just acquire
	 * samples continuously, until explicitly stopped by a certain command.
	 */
	SR_CONF_CONTINUOUS,

	/** The device has internal storage, into which data is logged. This
	 * starts or stops the internal logging. */
	SR_CONF_DATALOG,
};

/** Device instance data
 */
struct sr_dev_inst {
	/** Device driver. */
	struct sr_dev_driver *driver;
	/** Index of device in driver. */
	int index;
	/** Device instance status. SR_ST_NOT_FOUND, etc. */
	int status;
	/** Device instance type. SR_INST_USB, etc. */
	int inst_type;
	/** Device vendor. */
	char *vendor;
	/** Device model. */
	char *model;
	/** Device version. */
	char *version;
	/** List of channels. */
	GSList *channels;
	/** List of sr_channel_group structs */
	GSList *channel_groups;
	/** Device instance connection data (used?) */
	void *conn;
	/** Device instance private data (used?) */
	void *priv;
};

/** Types of device instance, struct sr_dev_inst.type */
enum {
	/** Device instance type for USB devices. */
	SR_INST_USB = 10000,
	/** Device instance type for serial port devices. */
	SR_INST_SERIAL,
	/** Device instance type for SCPI devices. */
	SR_INST_SCPI,
};

/** Device instance status, struct sr_dev_inst.status */
enum {
	/** The device instance was not found. */
	SR_ST_NOT_FOUND = 10000,
	/** The device instance was found, but is still booting. */
	SR_ST_INITIALIZING,
	/** The device instance is live, but not in use. */
	SR_ST_INACTIVE,
	/** The device instance is actively in use in a session. */
	SR_ST_ACTIVE,
	/** The device is winding down its session. */
	SR_ST_STOPPING,
};

/** Device driver data. See also http://sigrok.org/wiki/Hardware_driver_API . */
struct sr_dev_driver {
	/* Driver-specific */
	/** Driver name. Lowercase a-z, 0-9 and dashes (-) only. */
	char *name;
	/** Long name. Verbose driver name shown to user. */
	char *longname;
	/** API version (currently 1).	*/
	int api_version;
	/** Called when driver is loaded, e.g. program startup. */
	int (*init) (struct sr_context *sr_ctx);
	/** Called before driver is unloaded.
	 *  Driver must free all resouces held by it. */
	int (*cleanup) (void);
	/** Scan for devices. Driver should do all initialisation required.
	 *  Can be called several times, e.g. with different port options.
	 *  \retval NULL Error or no devices found.
	 *  \retval other GSList of a struct sr_dev_inst for each device.
	 *                Must be freed by caller!
	 */
	GSList *(*scan) (GSList *options);
	/** Get list of device instances the driver knows about.
	 *  \returns NULL or GSList of a struct sr_dev_inst for each device.
	 *           Must not be freed by caller!
	 */
	GSList *(*dev_list) (void);
	/** Clear list of devices the driver knows about. */
	int (*dev_clear) (void);
	/** Query value of a configuration key in driver or given device instance.
	 *  @see sr_config_get().
	 */
	int (*config_get) (int id, GVariant **data,
			const struct sr_dev_inst *sdi,
			const struct sr_channel_group *cg);
	/** Set value of a configuration key in driver or a given device instance.
	 *  @see sr_config_set(). */
	int (*config_set) (int id, GVariant *data,
			const struct sr_dev_inst *sdi,
			const struct sr_channel_group *cg);
	/** Channel status change.
	 *  @see sr_dev_channel_enable(), sr_dev_trigger_set(). */
	int (*config_channel_set) (const struct sr_dev_inst *sdi,
			struct sr_channel *ch, unsigned int changes);
	/** Apply configuration settings to the device hardware.
	 *  @see sr_config_commit().*/
	int (*config_commit) (const struct sr_dev_inst *sdi);
	/** List all possible values for a configuration key in a device instance.
	 *  @see sr_config_list().
	 */
	int (*config_list) (int info_id, GVariant **data,
			const struct sr_dev_inst *sdi,
			const struct sr_channel_group *cg);

	/* Device-specific */
	/** Open device */
	int (*dev_open) (struct sr_dev_inst *sdi);
	/** Close device */
	int (*dev_close) (struct sr_dev_inst *sdi);
	/** Begin data acquisition on the specified device. */
	int (*dev_acquisition_start) (const struct sr_dev_inst *sdi,
			void *cb_data);
	/** End data acquisition on the specified device. */
	int (*dev_acquisition_stop) (struct sr_dev_inst *sdi,
			void *cb_data);

	/* Dynamic */
	/** Device driver private data. Initialized by init(). */
	void *priv;
};

/**
 * @struct sr_session
 *
 * Opaque data structure representing a libsigrok session. None of the fields
 * of this structure are meant to be accessed directly.
 */
struct sr_session;

#include "proto.h"
#include "version.h"

#ifdef __cplusplus
}
#endif

#endif