[libsigrok.git] / hardware / demo / demo.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
#endif
#include "libsigrok.h"
#include "libsigrok-internal.h"

/* Message logging helpers with driver-specific prefix string. */
#define DRIVER_LOG_DOMAIN "demo: "
#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)

/* TODO: Number of probes should be configurable. */
#define NUM_PROBES             8

#define DEMONAME               "Demo device"

/* The size of chunks to send through the session bus. */
/* TODO: Should be configurable. */
#define BUFSIZE                4096

/* Supported patterns which we can generate */
enum {
	/**
	 * Pattern which spells "sigrok" using '0's (with '1's as "background")
	 * when displayed using the 'bits' output format.
	 */
	PATTERN_SIGROK,

	/** Pattern which consists of (pseudo-)random values on all probes. */
	PATTERN_RANDOM,

	/**
	 * Pattern which consists of incrementing numbers.
	 * TODO: Better description.
	 */
	PATTERN_INC,

	/** Pattern where all probes have a low logic state. */
	PATTERN_ALL_LOW,

	/** Pattern where all probes have a high logic state. */
	PATTERN_ALL_HIGH,
};

/* Private, per-device-instance driver context. */
struct dev_context {
	int pipe_fds[2];
	GIOChannel *channels[2];
	uint8_t sample_generator;
	uint64_t samples_counter;
	void *session_dev_id;
	int64_t starttime;
};

static const int hwcaps[] = {
	SR_HWCAP_LOGIC_ANALYZER,
	SR_HWCAP_DEMO_DEV,
	SR_HWCAP_SAMPLERATE,
	SR_HWCAP_PATTERN_MODE,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_LIMIT_MSEC,
	SR_HWCAP_CONTINUOUS,
};

static const struct sr_samplerates samplerates = {
	SR_HZ(1),
	SR_GHZ(1),
	SR_HZ(1),
	NULL,
};

static const char *pattern_strings[] = {
	"sigrok",
	"random",
	"incremental",
	"all-low",
	"all-high",
	NULL,
};

/* We name the probes 0-7 on our demo driver. */
static const char *probe_names[NUM_PROBES + 1] = {
	"0", "1", "2", "3", "4", "5", "6", "7",
	NULL,
};

static uint8_t pattern_sigrok[] = {
	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

/* Private, per-device-instance driver context. */
/* TODO: struct context as with the other drivers. */

/* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
SR_PRIV struct sr_dev_driver demo_driver_info;
static struct sr_dev_driver *di = &demo_driver_info;
static uint64_t cur_samplerate = SR_KHZ(200);
static uint64_t limit_samples = 0;
static uint64_t limit_msec = 0;
static int default_pattern = PATTERN_SIGROK;

static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);

static int clear_instances(void)
{
	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_init(struct sr_context *sr_ctx)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}
	drvc->sr_ctx = sr_ctx;
	di->priv = drvc;

	return SR_OK;
}

static GSList *hw_scan(GSList *options)
{
	struct sr_dev_inst *sdi;
	struct sr_probe *probe;
	struct drv_context *drvc;
	GSList *devices;
	int i;

	(void)options;

	drvc = di->priv;
	devices = NULL;

	sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	if (!sdi) {
		sr_err("%s: sr_dev_inst_new failed", __func__);
		return 0;
	}
	sdi->driver = di;

	for (i = 0; probe_names[i]; i++) {
		if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
				probe_names[i])))
			return NULL;
		sdi->probes = g_slist_append(sdi->probes, probe);
	}

	devices = g_slist_append(devices, sdi);
	drvc->instances = g_slist_append(drvc->instances, sdi);

	return devices;
}

static GSList *hw_dev_list(void)
{
	struct drv_context *drvc;

	drvc = di->priv;

	return drvc->instances;
}

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	(void)sdi;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_dev_close(struct sr_dev_inst *sdi)
{
	(void)sdi;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_cleanup(void)
{
	/* Nothing needed so far. */
	return SR_OK;
}

static int hw_info_get(int info_id, const void **data,
       const struct sr_dev_inst *sdi)
{
	(void)sdi;

	switch (info_id) {
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_SAMPLERATES:
		*data = &samplerates;
		break;
	case SR_DI_CUR_SAMPLERATE:
		*data = &cur_samplerate;
		break;
	case SR_DI_PATTERNS:
		*data = &pattern_strings;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
		const void *value)
{
	int ret;
	const char *stropt;

	(void)sdi;

	if (hwcap == SR_HWCAP_SAMPLERATE) {
		cur_samplerate = *(const uint64_t *)value;
		sr_dbg("%s: setting samplerate to %" PRIu64, __func__,
		       cur_samplerate);
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
		limit_msec = 0;
		limit_samples = *(const uint64_t *)value;
		sr_dbg("%s: setting limit_samples to %" PRIu64, __func__,
		       limit_samples);
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
		limit_msec = *(const uint64_t *)value;
		limit_samples = 0;
		sr_dbg("%s: setting limit_msec to %" PRIu64, __func__,
		       limit_msec);
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
		stropt = value;
		ret = SR_OK;
		if (!strcmp(stropt, "sigrok")) {
			default_pattern = PATTERN_SIGROK;
		} else if (!strcmp(stropt, "random")) {
			default_pattern = PATTERN_RANDOM;
		} else if (!strcmp(stropt, "incremental")) {
			default_pattern = PATTERN_INC;
		} else if (!strcmp(stropt, "all-low")) {
			default_pattern = PATTERN_ALL_LOW;
		} else if (!strcmp(stropt, "all-high")) {
			default_pattern = PATTERN_ALL_HIGH;
		} else {
			ret = SR_ERR;
		}
		sr_dbg("%s: setting pattern to %d", __func__, default_pattern);
	} else {
		ret = SR_ERR;
	}

	return ret;
}

static void samples_generator(uint8_t *buf, uint64_t size,
			      struct dev_context *devc)
{
	static uint64_t p = 0;
	uint64_t i;

	/* TODO: Needed? */
	memset(buf, 0, size);

	switch (devc->sample_generator) {
	case PATTERN_SIGROK: /* sigrok pattern */
		for (i = 0; i < size; i++) {
			*(buf + i) = ~(pattern_sigrok[p] >> 1);
			if (++p == 64)
				p = 0;
		}
		break;
	case PATTERN_RANDOM: /* Random */
		for (i = 0; i < size; i++)
			*(buf + i) = (uint8_t)(rand() & 0xff);
		break;
	case PATTERN_INC: /* Simple increment */
		for (i = 0; i < size; i++)
			*(buf + i) = i;
		break;
	case PATTERN_ALL_LOW: /* All probes are low */
		memset(buf, 0x00, size);
		break;
	case PATTERN_ALL_HIGH: /* All probes are high */
		memset(buf, 0xff, size);
		break;
	default:
		sr_err("Unknown pattern: %d.", devc->sample_generator);
		break;
	}
}

/* Callback handling data */
static int receive_data(int fd, int revents, void *cb_data)
{
	struct dev_context *devc = cb_data;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	uint8_t buf[BUFSIZE];
	static uint64_t samples_to_send, expected_samplenum, sending_now;
	int64_t time, elapsed;

	(void)fd;
	(void)revents;

	/* How many "virtual" samples should we have collected by now? */
	time = g_get_monotonic_time();
	elapsed = time - devc->starttime;
	expected_samplenum = elapsed * cur_samplerate / 1000000;
	/* Of those, how many do we still have to send? */
	samples_to_send = expected_samplenum - devc->samples_counter;

	if (limit_samples) {
		samples_to_send = MIN(samples_to_send,
				 limit_samples - devc->samples_counter);
	}

	while (samples_to_send > 0) {
		sending_now = MIN(samples_to_send, sizeof(buf));
		samples_to_send -= sending_now;
		samples_generator(buf, sending_now, devc);

		packet.type = SR_DF_LOGIC;
		packet.payload = &logic;
		logic.length = sending_now;
		logic.unitsize = 1;
		logic.data = buf;
		sr_session_send(devc->session_dev_id, &packet);
		devc->samples_counter += sending_now;
	}

	if (limit_samples && devc->samples_counter >= limit_samples) {
		sr_info("Requested number of samples reached.");
		hw_dev_acquisition_stop(NULL, cb_data);
		return TRUE;
	}

	return TRUE;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
		void *cb_data)
{
	struct sr_datafeed_packet *packet;
	struct sr_datafeed_header *header;
	struct dev_context *devc;

	(void)sdi;

	sr_dbg("Starting acquisition.");

	/* TODO: 'devc' is never g_free()'d? */
	if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
		sr_err("%s: devc malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	devc->sample_generator = default_pattern;
	devc->session_dev_id = cb_data;
	devc->samples_counter = 0;

	/*
	 * Setting two channels connected by a pipe is a remnant from when the
	 * demo driver generated data in a thread, and collected and sent the
	 * data in the main program loop.
	 * They are kept here because it provides a convenient way of setting
	 * up a timeout-based polling mechanism.
	 */
	if (pipe(devc->pipe_fds)) {
		/* TODO: Better error message. */
		sr_err("%s: pipe() failed", __func__);
		return SR_ERR;
	}

	devc->channels[0] = g_io_channel_unix_new(devc->pipe_fds[0]);
	devc->channels[1] = g_io_channel_unix_new(devc->pipe_fds[1]);

	g_io_channel_set_flags(devc->channels[0], G_IO_FLAG_NONBLOCK, NULL);

	/* Set channel encoding to binary (default is UTF-8). */
	g_io_channel_set_encoding(devc->channels[0], NULL, NULL);
	g_io_channel_set_encoding(devc->channels[1], NULL, NULL);

	/* Make channels to unbuffered. */
	g_io_channel_set_buffered(devc->channels[0], FALSE);
	g_io_channel_set_buffered(devc->channels[1], FALSE);

	sr_session_source_add_channel(devc->channels[0], G_IO_IN | G_IO_ERR,
		    40, receive_data, devc);

	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
		sr_err("%s: packet malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
		sr_err("%s: header malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	packet->type = SR_DF_HEADER;
	packet->payload = header;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	sr_session_send(devc->session_dev_id, packet);

	/* We use this timestamp to decide how many more samples to send. */
	devc->starttime = g_get_monotonic_time();

	g_free(header);
	g_free(packet);

	return SR_OK;
}

static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct dev_context *devc;
	struct sr_datafeed_packet packet;

	(void)sdi;

	devc = cb_data;

	sr_dbg("Stopping aquisition.");

	sr_session_source_remove_channel(devc->channels[0]);
	g_io_channel_shutdown(devc->channels[0], FALSE, NULL);

	/* Send last packet. */
	packet.type = SR_DF_END;
	sr_session_send(devc->session_dev_id, &packet);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver demo_driver_info = {
	.name = "demo",
	.longname = "Demo driver and pattern generator",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	5	* Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
	6	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	#include <stdlib.h>
	24	#include <unistd.h>
	25	#include <string.h>
	26	#ifdef _WIN32
	27	#include <io.h>
	28	#include <fcntl.h>
	29	#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
	30	#endif
	31	#include "libsigrok.h"
	32	#include "libsigrok-internal.h"
	33
	34	/* Message logging helpers with driver-specific prefix string. */
	35	#define DRIVER_LOG_DOMAIN "demo: "
	36	#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
	37	#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
	38	#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
	39	#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
	40	#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
	41	#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
	42
	43	/* TODO: Number of probes should be configurable. */
	44	#define NUM_PROBES 8
	45
	46	#define DEMONAME "Demo device"
	47
	48	/* The size of chunks to send through the session bus. */
	49	/* TODO: Should be configurable. */
	50	#define BUFSIZE 4096
	51
	52	/* Supported patterns which we can generate */
	53	enum {
	54	/**
	55	* Pattern which spells "sigrok" using '0's (with '1's as "background")
	56	* when displayed using the 'bits' output format.
	57	*/
	58	PATTERN_SIGROK,
	59
	60	/** Pattern which consists of (pseudo-)random values on all probes. */
	61	PATTERN_RANDOM,
	62
	63	/**
	64	* Pattern which consists of incrementing numbers.
	65	* TODO: Better description.
	66	*/
	67	PATTERN_INC,
	68
	69	/** Pattern where all probes have a low logic state. */
	70	PATTERN_ALL_LOW,
	71
	72	/** Pattern where all probes have a high logic state. */
	73	PATTERN_ALL_HIGH,
	74	};
	75
	76	/* Private, per-device-instance driver context. */
	77	struct dev_context {
	78	int pipe_fds[2];
	79	GIOChannel *channels[2];
	80	uint8_t sample_generator;
	81	uint64_t samples_counter;
	82	void *session_dev_id;
	83	int64_t starttime;
	84	};
	85
	86	static const int hwcaps[] = {
	87	SR_HWCAP_LOGIC_ANALYZER,
	88	SR_HWCAP_DEMO_DEV,
	89	SR_HWCAP_SAMPLERATE,
	90	SR_HWCAP_PATTERN_MODE,
	91	SR_HWCAP_LIMIT_SAMPLES,
	92	SR_HWCAP_LIMIT_MSEC,
	93	SR_HWCAP_CONTINUOUS,
	94	};
	95
	96	static const struct sr_samplerates samplerates = {
	97	SR_HZ(1),
	98	SR_GHZ(1),
	99	SR_HZ(1),
	100	NULL,
	101	};
	102
	103	static const char *pattern_strings[] = {
	104	"sigrok",
	105	"random",
	106	"incremental",
	107	"all-low",
	108	"all-high",
	109	NULL,
	110	};
	111
	112	/* We name the probes 0-7 on our demo driver. */
	113	static const char *probe_names[NUM_PROBES + 1] = {
	114	"0", "1", "2", "3", "4", "5", "6", "7",
	115	NULL,
	116	};
	117
	118	static uint8_t pattern_sigrok[] = {
	119	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	120	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	121	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	122	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	123	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	124	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	125	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	126	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	127	};
	128
	129	/* Private, per-device-instance driver context. */
	130	/* TODO: struct context as with the other drivers. */
	131
	132	/* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
	133	SR_PRIV struct sr_dev_driver demo_driver_info;
	134	static struct sr_dev_driver *di = &demo_driver_info;
	135	static uint64_t cur_samplerate = SR_KHZ(200);
	136	static uint64_t limit_samples = 0;
	137	static uint64_t limit_msec = 0;
	138	static int default_pattern = PATTERN_SIGROK;
	139
	140	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data);
	141
	142	static int clear_instances(void)
	143	{
	144	/* Nothing needed so far. */
	145
	146	return SR_OK;
	147	}
	148
	149	static int hw_init(struct sr_context *sr_ctx)
	150	{
	151	struct drv_context *drvc;
	152
	153	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	154	sr_err("Driver context malloc failed.");
	155	return SR_ERR_MALLOC;
	156	}
	157	drvc->sr_ctx = sr_ctx;
	158	di->priv = drvc;
	159
	160	return SR_OK;
	161	}
	162
	163	static GSList hw_scan(GSList options)
	164	{
	165	struct sr_dev_inst *sdi;
	166	struct sr_probe *probe;
	167	struct drv_context *drvc;
	168	GSList *devices;
	169	int i;
	170
	171	(void)options;
	172
	173	drvc = di->priv;
	174	devices = NULL;
	175
	176	sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	177	if (!sdi) {
	178	sr_err("%s: sr_dev_inst_new failed", __func__);
	179	return 0;
	180	}
	181	sdi->driver = di;
	182
	183	for (i = 0; probe_names[i]; i++) {
	184	if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
	185	probe_names[i])))
	186	return NULL;
	187	sdi->probes = g_slist_append(sdi->probes, probe);
	188	}
	189
	190	devices = g_slist_append(devices, sdi);
	191	drvc->instances = g_slist_append(drvc->instances, sdi);
	192
	193	return devices;
	194	}
	195
	196	static GSList *hw_dev_list(void)
	197	{
	198	struct drv_context *drvc;
	199
	200	drvc = di->priv;
	201
	202	return drvc->instances;
	203	}
	204
	205	static int hw_dev_open(struct sr_dev_inst *sdi)
	206	{
	207	(void)sdi;
	208
	209	/* Nothing needed so far. */
	210
	211	return SR_OK;
	212	}
	213
	214	static int hw_dev_close(struct sr_dev_inst *sdi)
	215	{
	216	(void)sdi;
	217
	218	/* Nothing needed so far. */
	219
	220	return SR_OK;
	221	}
	222
	223	static int hw_cleanup(void)
	224	{
	225	/* Nothing needed so far. */
	226	return SR_OK;
	227	}
	228
	229	static int hw_info_get(int info_id, const void **data,
	230	const struct sr_dev_inst *sdi)
	231	{
	232	(void)sdi;
	233
	234	switch (info_id) {
	235	case SR_DI_HWCAPS:
	236	*data = hwcaps;
	237	break;
	238	case SR_DI_SAMPLERATES:
	239	*data = &samplerates;
	240	break;
	241	case SR_DI_CUR_SAMPLERATE:
	242	*data = &cur_samplerate;
	243	break;
	244	case SR_DI_PATTERNS:
	245	*data = &pattern_strings;
	246	break;
	247	default:
	248	return SR_ERR_ARG;
	249	}
	250
	251	return SR_OK;
	252	}
	253
	254	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	255	const void *value)
	256	{
	257	int ret;
	258	const char *stropt;
	259
	260	(void)sdi;
	261
	262	if (hwcap == SR_HWCAP_SAMPLERATE) {
	263	cur_samplerate = (const uint64_t )value;
	264	sr_dbg("%s: setting samplerate to %" PRIu64, __func__,
	265	cur_samplerate);
	266	ret = SR_OK;
	267	} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
	268	limit_msec = 0;
	269	limit_samples = (const uint64_t )value;
	270	sr_dbg("%s: setting limit_samples to %" PRIu64, __func__,
	271	limit_samples);
	272	ret = SR_OK;
	273	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
	274	limit_msec = (const uint64_t )value;
	275	limit_samples = 0;
	276	sr_dbg("%s: setting limit_msec to %" PRIu64, __func__,
	277	limit_msec);
	278	ret = SR_OK;
	279	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
	280	stropt = value;
	281	ret = SR_OK;
	282	if (!strcmp(stropt, "sigrok")) {
	283	default_pattern = PATTERN_SIGROK;
	284	} else if (!strcmp(stropt, "random")) {
	285	default_pattern = PATTERN_RANDOM;
	286	} else if (!strcmp(stropt, "incremental")) {
	287	default_pattern = PATTERN_INC;
	288	} else if (!strcmp(stropt, "all-low")) {
	289	default_pattern = PATTERN_ALL_LOW;
	290	} else if (!strcmp(stropt, "all-high")) {
	291	default_pattern = PATTERN_ALL_HIGH;
	292	} else {
	293	ret = SR_ERR;
	294	}
	295	sr_dbg("%s: setting pattern to %d", __func__, default_pattern);
	296	} else {
	297	ret = SR_ERR;
	298	}
	299
	300	return ret;
	301	}
	302
	303	static void samples_generator(uint8_t *buf, uint64_t size,
	304	struct dev_context *devc)
	305	{
	306	static uint64_t p = 0;
	307	uint64_t i;
	308
	309	/* TODO: Needed? */
	310	memset(buf, 0, size);
	311
	312	switch (devc->sample_generator) {
	313	case PATTERN_SIGROK: /* sigrok pattern */
	314	for (i = 0; i < size; i++) {
	315	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	316	if (++p == 64)
	317	p = 0;
	318	}
	319	break;
	320	case PATTERN_RANDOM: /* Random */
	321	for (i = 0; i < size; i++)
	322	*(buf + i) = (uint8_t)(rand() & 0xff);
	323	break;
	324	case PATTERN_INC: /* Simple increment */
	325	for (i = 0; i < size; i++)
	326	*(buf + i) = i;
	327	break;
	328	case PATTERN_ALL_LOW: /* All probes are low */
	329	memset(buf, 0x00, size);
	330	break;
	331	case PATTERN_ALL_HIGH: /* All probes are high */
	332	memset(buf, 0xff, size);
	333	break;
	334	default:
	335	sr_err("Unknown pattern: %d.", devc->sample_generator);
	336	break;
	337	}
	338	}
	339
	340	/* Callback handling data */
	341	static int receive_data(int fd, int revents, void *cb_data)
	342	{
	343	struct dev_context *devc = cb_data;
	344	struct sr_datafeed_packet packet;
	345	struct sr_datafeed_logic logic;
	346	uint8_t buf[BUFSIZE];
	347	static uint64_t samples_to_send, expected_samplenum, sending_now;
	348	int64_t time, elapsed;
	349
	350	(void)fd;
	351	(void)revents;
	352
	353	/* How many "virtual" samples should we have collected by now? */
	354	time = g_get_monotonic_time();
	355	elapsed = time - devc->starttime;
	356	expected_samplenum = elapsed * cur_samplerate / 1000000;
	357	/* Of those, how many do we still have to send? */
	358	samples_to_send = expected_samplenum - devc->samples_counter;
	359
	360	if (limit_samples) {
	361	samples_to_send = MIN(samples_to_send,
	362	limit_samples - devc->samples_counter);
	363	}
	364
	365	while (samples_to_send > 0) {
	366	sending_now = MIN(samples_to_send, sizeof(buf));
	367	samples_to_send -= sending_now;
	368	samples_generator(buf, sending_now, devc);
	369
	370	packet.type = SR_DF_LOGIC;
	371	packet.payload = &logic;
	372	logic.length = sending_now;
	373	logic.unitsize = 1;
	374	logic.data = buf;
	375	sr_session_send(devc->session_dev_id, &packet);
	376	devc->samples_counter += sending_now;
	377	}
	378
	379	if (limit_samples && devc->samples_counter >= limit_samples) {
	380	sr_info("Requested number of samples reached.");
	381	hw_dev_acquisition_stop(NULL, cb_data);
	382	return TRUE;
	383	}
	384
	385	return TRUE;
	386	}
	387
	388	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	389	void *cb_data)
	390	{
	391	struct sr_datafeed_packet *packet;
	392	struct sr_datafeed_header *header;
	393	struct dev_context *devc;
	394
	395	(void)sdi;
	396
	397	sr_dbg("Starting acquisition.");
	398
	399	/* TODO: 'devc' is never g_free()'d? */
	400	if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
	401	sr_err("%s: devc malloc failed", __func__);
	402	return SR_ERR_MALLOC;
	403	}
	404
	405	devc->sample_generator = default_pattern;
	406	devc->session_dev_id = cb_data;
	407	devc->samples_counter = 0;
	408
	409	/*
	410	* Setting two channels connected by a pipe is a remnant from when the
	411	* demo driver generated data in a thread, and collected and sent the
	412	* data in the main program loop.
	413	* They are kept here because it provides a convenient way of setting
	414	* up a timeout-based polling mechanism.
	415	*/
	416	if (pipe(devc->pipe_fds)) {
	417	/* TODO: Better error message. */
	418	sr_err("%s: pipe() failed", __func__);
	419	return SR_ERR;
	420	}
	421
	422	devc->channels[0] = g_io_channel_unix_new(devc->pipe_fds[0]);
	423	devc->channels[1] = g_io_channel_unix_new(devc->pipe_fds[1]);
	424
	425	g_io_channel_set_flags(devc->channels[0], G_IO_FLAG_NONBLOCK, NULL);
	426
	427	/* Set channel encoding to binary (default is UTF-8). */
	428	g_io_channel_set_encoding(devc->channels[0], NULL, NULL);
	429	g_io_channel_set_encoding(devc->channels[1], NULL, NULL);
	430
	431	/* Make channels to unbuffered. */
	432	g_io_channel_set_buffered(devc->channels[0], FALSE);
	433	g_io_channel_set_buffered(devc->channels[1], FALSE);
	434
	435	sr_session_source_add_channel(devc->channels[0], G_IO_IN \| G_IO_ERR,
	436	40, receive_data, devc);
	437
	438	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	439	sr_err("%s: packet malloc failed", __func__);
	440	return SR_ERR_MALLOC;
	441	}
	442
	443	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	444	sr_err("%s: header malloc failed", __func__);
	445	return SR_ERR_MALLOC;
	446	}
	447
	448	packet->type = SR_DF_HEADER;
	449	packet->payload = header;
	450	header->feed_version = 1;
	451	gettimeofday(&header->starttime, NULL);
	452	sr_session_send(devc->session_dev_id, packet);
	453
	454	/* We use this timestamp to decide how many more samples to send. */
	455	devc->starttime = g_get_monotonic_time();
	456
	457	g_free(header);
	458	g_free(packet);
	459
	460	return SR_OK;
	461	}
	462
	463	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	464	{
	465	struct dev_context *devc;
	466	struct sr_datafeed_packet packet;
	467
	468	(void)sdi;
	469
	470	devc = cb_data;
	471
	472	sr_dbg("Stopping aquisition.");
	473
	474	sr_session_source_remove_channel(devc->channels[0]);
	475	g_io_channel_shutdown(devc->channels[0], FALSE, NULL);
	476
	477	/* Send last packet. */
	478	packet.type = SR_DF_END;
	479	sr_session_send(devc->session_dev_id, &packet);
	480
	481	return SR_OK;
	482	}
	483
	484	SR_PRIV struct sr_dev_driver demo_driver_info = {
	485	.name = "demo",
	486	.longname = "Demo driver and pattern generator",
	487	.api_version = 1,
	488	.init = hw_init,
	489	.cleanup = hw_cleanup,
	490	.scan = hw_scan,
	491	.dev_list = hw_dev_list,
	492	.dev_clear = clear_instances,
	493	.dev_open = hw_dev_open,
	494	.dev_close = hw_dev_close,
	495	.info_get = hw_info_get,
	496	.dev_config_set = hw_dev_config_set,
	497	.dev_acquisition_start = hw_dev_acquisition_start,
	498	.dev_acquisition_stop = hw_dev_acquisition_stop,
	499	.priv = NULL,
	500	};