[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>
 *
 * 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>
#include <sigrok.h>
#include <sigrok-internal.h>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
#endif
#include "config.h"

#define NUM_PROBES             8
#define DEMONAME               "Demo device"
/* size of chunks to send through the session bus */
#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.
	 */
	GENMODE_SIGROK,

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

	/**
	 * Pattern which consists of incrementing numbers.
	 * TODO: Better description.
	 */
	GENMODE_INC,
};

/* FIXME: Should not be global. */
GIOChannel *channels[2];

struct databag {
	int pipe_fds[2];
	uint8_t sample_generator;
	uint8_t thread_running;
	uint64_t samples_counter;
	int device_index;
	gpointer session_device_id;
	GTimer *timer;
};

static int capabilities[] = {
	SR_HWCAP_LOGIC_ANALYZER,
	SR_HWCAP_SAMPLERATE,
	SR_HWCAP_PATTERN_MODE,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_LIMIT_MSEC,
	SR_HWCAP_CONTINUOUS,
};

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

static const char *patternmodes[] = {
	"random",
	"incremental",
	NULL,
};

static uint8_t genmode_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,
};

/* List of struct sr_device_instance, maintained by opendev()/closedev(). */
static GSList *device_instances = NULL;
static uint64_t cur_samplerate = SR_KHZ(200);
static uint64_t limit_samples = 0;
static uint64_t limit_msec = 0;
static int default_genmode = GENMODE_SIGROK;
static GThread *my_thread;
static int thread_running;

static void hw_stop_acquisition(int device_index, gpointer session_device_id);

static int hw_init(const char *deviceinfo)
{
	struct sr_device_instance *sdi;

	/* Avoid compiler warnings. */
	deviceinfo = deviceinfo;

	sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	if (!sdi)
		return 0;

	device_instances = g_slist_append(device_instances, sdi);

	return 1;
}

static int hw_opendev(int device_index)
{
	/* Avoid compiler warnings. */
	device_index = device_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_closedev(int device_index)
{
	/* Avoid compiler warnings. */
	device_index = device_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static void hw_cleanup(void)
{
	/* Nothing needed so far. */
}

static void *hw_get_device_info(int device_index, int device_info_id)
{
	struct sr_device_instance *sdi;
	void *info = NULL;

	if (!(sdi = sr_get_device_instance(device_instances, device_index)))
		return NULL;

	switch (device_info_id) {
	case SR_DI_INSTANCE:
		info = sdi;
		break;
	case SR_DI_NUM_PROBES:
		info = GINT_TO_POINTER(NUM_PROBES);
		break;
	case SR_DI_SAMPLERATES:
		info = &samplerates;
		break;
	case SR_DI_CUR_SAMPLERATE:
		info = &cur_samplerate;
		break;
	case SR_DI_PATTERNMODES:
		info = &patternmodes;
		break;
	}

	return info;
}

static int hw_get_status(int device_index)
{
	/* Avoid compiler warnings. */
	device_index = device_index;

	return SR_ST_ACTIVE;
}

static int *hw_get_capabilities(void)
{
	return capabilities;
}

static int hw_set_configuration(int device_index, int capability, void *value)
{
	int ret;
	char *stropt;

	/* Avoid compiler warnings. */
	device_index = device_index;

	if (capability == SR_HWCAP_PROBECONFIG) {
		/* Nothing to do, but must be supported */
		ret = SR_OK;
	} else if (capability == SR_HWCAP_SAMPLERATE) {
		cur_samplerate = *(uint64_t *)value;
		sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
		       cur_samplerate);
		ret = SR_OK;
	} else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
		limit_samples = *(uint64_t *)value;
		sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
		       limit_samples);
		ret = SR_OK;
	} else if (capability == SR_HWCAP_LIMIT_MSEC) {
		limit_msec = *(uint64_t *)value;
		sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
		       limit_msec);
		ret = SR_OK;
	} else if (capability == SR_HWCAP_PATTERN_MODE) {
		stropt = value;
		if (!strcmp(stropt, "random")) {
			default_genmode = GENMODE_RANDOM;
			ret = SR_OK;
		} else if (!strcmp(stropt, "incremental")) {
			default_genmode = GENMODE_INC;
			ret = SR_OK;
		} else {
			ret = SR_ERR;
		}
		sr_dbg("demo: %s: setting patternmode to %d", __func__,
		       default_genmode);
	} else {
		ret = SR_ERR;
	}

	return ret;
}

static void samples_generator(uint8_t *buf, uint64_t size, void *data)
{
	static uint64_t p = 0;
	struct databag *mydata = data;
	uint64_t i;

	memset(buf, 0, size);

	switch (mydata->sample_generator) {
	case GENMODE_SIGROK:
		for (i = 0; i < size; i++) {
			*(buf + i) = ~(genmode_sigrok[p] >> 1);
			if (++p == 64)
				p = 0;
		}
		break;
	case GENMODE_RANDOM: /* Random */
		for (i = 0; i < size; i++)
			*(buf + i) = (uint8_t)(rand() & 0xff);
		break;
	case GENMODE_INC: /* Simple increment */
		for (i = 0; i < size; i++)
			*(buf + i) = i;
		break;
	}
}

/* Thread function */
static void thread_func(void *data)
{
	struct databag *mydata = data;
	uint8_t buf[BUFSIZE];
	uint64_t nb_to_send = 0;
	int bytes_written;

	double time_cur, time_last, time_diff;

	time_last = g_timer_elapsed(mydata->timer, NULL);

	while (thread_running) {
		/* Rate control */
		time_cur = g_timer_elapsed(mydata->timer, NULL);

		time_diff = time_cur - time_last;
		time_last = time_cur;

		nb_to_send = cur_samplerate * time_diff;

		if (limit_samples)
			nb_to_send = MIN(nb_to_send,
					limit_samples - mydata->samples_counter);

		/* Make sure we don't overflow. */
		nb_to_send = MIN(nb_to_send, BUFSIZE);

		if (nb_to_send) {
			samples_generator(buf, nb_to_send, data);
			mydata->samples_counter += nb_to_send;

			g_io_channel_write_chars(channels[1], (gchar *)&buf,
					nb_to_send, (gsize *)&bytes_written, NULL);
		}

		/* Check if we're done. */
		if ((limit_msec && time_cur * 1000 > limit_msec) ||
		    (limit_samples && mydata->samples_counter >= limit_samples))
		{
			close(mydata->pipe_fds[1]);
			thread_running = 0;
		}

		g_usleep(10);
	}
}

/* Callback handling data */
static int receive_data(int fd, int revents, void *user_data)
{
	struct sr_datafeed_packet packet;
	char c[BUFSIZE];
	gsize z;

	/* Avoid compiler warnings. */
	fd = fd;
	revents = revents;

	do {
		g_io_channel_read_chars(channels[0],
				        (gchar *)&c, BUFSIZE, &z, NULL);

		if (z > 0) {
			packet.type = SR_DF_LOGIC;
			packet.length = z;
			packet.unitsize = 1;
			packet.payload = c;
			sr_session_bus(user_data, &packet);
		}
	} while (z > 0);

	if (!thread_running && z <= 0)
	{
		/* Make sure we don't receive more packets */
		g_io_channel_close(channels[0]);

		/* Send last packet. */
		packet.type = SR_DF_END;
		sr_session_bus(user_data, &packet);

		return FALSE;
	}

	return TRUE;
}

static int hw_start_acquisition(int device_index, gpointer session_device_id)
{
	struct sr_datafeed_packet *packet;
	struct sr_datafeed_header *header;
	struct databag *mydata;

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

	mydata->sample_generator = default_genmode;
	mydata->session_device_id = session_device_id;
	mydata->device_index = device_index;
	mydata->samples_counter = 0;

	if (pipe(mydata->pipe_fds))
		return SR_ERR;

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

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

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

	sr_source_add(mydata->pipe_fds[0], G_IO_IN | G_IO_ERR, 40,
		      receive_data, session_device_id);

	/* Run the demo thread. */
	g_thread_init(NULL);
	/* this needs to be done between g_thread_init() and g_thread_create() */
	mydata->timer = g_timer_new();
	thread_running = 1;
	my_thread =
	    g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	if (!my_thread)
		return SR_ERR;

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

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

	packet->type = SR_DF_HEADER;
	packet->length = sizeof(struct sr_datafeed_header);
	packet->payload = (unsigned char *)header;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	header->samplerate = cur_samplerate;
	header->protocol_id = SR_PROTO_RAW;
	header->num_logic_probes = NUM_PROBES;
	header->num_analog_probes = 0;
	sr_session_bus(session_device_id, packet);
	g_free(header);
	g_free(packet);

	return SR_OK;
}

static void hw_stop_acquisition(int device_index, gpointer session_device_id)
{
	/* Avoid compiler warnings. */
	device_index = device_index;
	session_device_id = session_device_id;

	/* Stop generate thread. */
	thread_running = 0;
}

struct sr_device_plugin demo_plugin_info = {
	.name = "demo",
	.longname = "Demo driver and pattern generator",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.opendev = hw_opendev,
	.closedev = hw_closedev,
	.get_device_info = hw_get_device_info,
	.get_status = hw_get_status,
	.get_capabilities = hw_get_capabilities,
	.set_configuration = hw_set_configuration,
	.start_acquisition = hw_start_acquisition,
	.stop_acquisition = hw_stop_acquisition,
};
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	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include <stdlib.h>
	23	#include <unistd.h>
	24	#include <string.h>
	25	#include <sigrok.h>
	26	#include <sigrok-internal.h>
	27	#ifdef _WIN32
	28	#include <io.h>
	29	#include <fcntl.h>
	30	#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
	31	#endif
	32	#include "config.h"
	33
	34	#define NUM_PROBES 8
	35	#define DEMONAME "Demo device"
	36	/* size of chunks to send through the session bus */
	37	#define BUFSIZE 4096
	38
	39	/* Supported patterns which we can generate */
	40	enum {
	41	/**
	42	* Pattern which spells "sigrok" using '0's (with '1's as "background")
	43	* when displayed using the 'bits' output format.
	44	*/
	45	GENMODE_SIGROK,
	46
	47	/**
	48	* Pattern which consists of (pseudo-)random values on all probes.
	49	*/
	50	GENMODE_RANDOM,
	51
	52	/**
	53	* Pattern which consists of incrementing numbers.
	54	* TODO: Better description.
	55	*/
	56	GENMODE_INC,
	57	};
	58
	59	/* FIXME: Should not be global. */
	60	GIOChannel *channels[2];
	61
	62	struct databag {
	63	int pipe_fds[2];
	64	uint8_t sample_generator;
	65	uint8_t thread_running;
	66	uint64_t samples_counter;
	67	int device_index;
	68	gpointer session_device_id;
	69	GTimer *timer;
	70	};
	71
	72	static int capabilities[] = {
	73	SR_HWCAP_LOGIC_ANALYZER,
	74	SR_HWCAP_SAMPLERATE,
	75	SR_HWCAP_PATTERN_MODE,
	76	SR_HWCAP_LIMIT_SAMPLES,
	77	SR_HWCAP_LIMIT_MSEC,
	78	SR_HWCAP_CONTINUOUS,
	79	};
	80
	81	static struct sr_samplerates samplerates = {
	82	SR_HZ(1),
	83	SR_GHZ(1),
	84	SR_HZ(1),
	85	NULL,
	86	};
	87
	88	static const char *patternmodes[] = {
	89	"random",
	90	"incremental",
	91	NULL,
	92	};
	93
	94	static uint8_t genmode_sigrok[] = {
	95	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	96	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	97	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	98	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	99	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	100	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	101	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	102	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	103	};
	104
	105	/* List of struct sr_device_instance, maintained by opendev()/closedev(). */
	106	static GSList *device_instances = NULL;
	107	static uint64_t cur_samplerate = SR_KHZ(200);
	108	static uint64_t limit_samples = 0;
	109	static uint64_t limit_msec = 0;
	110	static int default_genmode = GENMODE_SIGROK;
	111	static GThread *my_thread;
	112	static int thread_running;
	113
	114	static void hw_stop_acquisition(int device_index, gpointer session_device_id);
	115
	116	static int hw_init(const char *deviceinfo)
	117	{
	118	struct sr_device_instance *sdi;
	119
	120	/* Avoid compiler warnings. */
	121	deviceinfo = deviceinfo;
	122
	123	sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	124	if (!sdi)
	125	return 0;
	126
	127	device_instances = g_slist_append(device_instances, sdi);
	128
	129	return 1;
	130	}
	131
	132	static int hw_opendev(int device_index)
	133	{
	134	/* Avoid compiler warnings. */
	135	device_index = device_index;
	136
	137	/* Nothing needed so far. */
	138
	139	return SR_OK;
	140	}
	141
	142	static int hw_closedev(int device_index)
	143	{
	144	/* Avoid compiler warnings. */
	145	device_index = device_index;
	146
	147	/* Nothing needed so far. */
	148
	149	return SR_OK;
	150	}
	151
	152	static void hw_cleanup(void)
	153	{
	154	/* Nothing needed so far. */
	155	}
	156
	157	static void *hw_get_device_info(int device_index, int device_info_id)
	158	{
	159	struct sr_device_instance *sdi;
	160	void *info = NULL;
	161
	162	if (!(sdi = sr_get_device_instance(device_instances, device_index)))
	163	return NULL;
	164
	165	switch (device_info_id) {
	166	case SR_DI_INSTANCE:
	167	info = sdi;
	168	break;
	169	case SR_DI_NUM_PROBES:
	170	info = GINT_TO_POINTER(NUM_PROBES);
	171	break;
	172	case SR_DI_SAMPLERATES:
	173	info = &samplerates;
	174	break;
	175	case SR_DI_CUR_SAMPLERATE:
	176	info = &cur_samplerate;
	177	break;
	178	case SR_DI_PATTERNMODES:
	179	info = &patternmodes;
	180	break;
	181	}
	182
	183	return info;
	184	}
	185
	186	static int hw_get_status(int device_index)
	187	{
	188	/* Avoid compiler warnings. */
	189	device_index = device_index;
	190
	191	return SR_ST_ACTIVE;
	192	}
	193
	194	static int *hw_get_capabilities(void)
	195	{
	196	return capabilities;
	197	}
	198
	199	static int hw_set_configuration(int device_index, int capability, void *value)
	200	{
	201	int ret;
	202	char *stropt;
	203
	204	/* Avoid compiler warnings. */
	205	device_index = device_index;
	206
	207	if (capability == SR_HWCAP_PROBECONFIG) {
	208	/* Nothing to do, but must be supported */
	209	ret = SR_OK;
	210	} else if (capability == SR_HWCAP_SAMPLERATE) {
	211	cur_samplerate = (uint64_t )value;
	212	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	213	cur_samplerate);
	214	ret = SR_OK;
	215	} else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
	216	limit_samples = (uint64_t )value;
	217	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	218	limit_samples);
	219	ret = SR_OK;
	220	} else if (capability == SR_HWCAP_LIMIT_MSEC) {
	221	limit_msec = (uint64_t )value;
	222	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	223	limit_msec);
	224	ret = SR_OK;
	225	} else if (capability == SR_HWCAP_PATTERN_MODE) {
	226	stropt = value;
	227	if (!strcmp(stropt, "random")) {
	228	default_genmode = GENMODE_RANDOM;
	229	ret = SR_OK;
	230	} else if (!strcmp(stropt, "incremental")) {
	231	default_genmode = GENMODE_INC;
	232	ret = SR_OK;
	233	} else {
	234	ret = SR_ERR;
	235	}
	236	sr_dbg("demo: %s: setting patternmode to %d", __func__,
	237	default_genmode);
	238	} else {
	239	ret = SR_ERR;
	240	}
	241
	242	return ret;
	243	}
	244
	245	static void samples_generator(uint8_t buf, uint64_t size, void data)
	246	{
	247	static uint64_t p = 0;
	248	struct databag *mydata = data;
	249	uint64_t i;
	250
	251	memset(buf, 0, size);
	252
	253	switch (mydata->sample_generator) {
	254	case GENMODE_SIGROK:
	255	for (i = 0; i < size; i++) {
	256	*(buf + i) = ~(genmode_sigrok[p] >> 1);
	257	if (++p == 64)
	258	p = 0;
	259	}
	260	break;
	261	case GENMODE_RANDOM: /* Random */
	262	for (i = 0; i < size; i++)
	263	*(buf + i) = (uint8_t)(rand() & 0xff);
	264	break;
	265	case GENMODE_INC: /* Simple increment */
	266	for (i = 0; i < size; i++)
	267	*(buf + i) = i;
	268	break;
	269	}
	270	}
	271
	272	/* Thread function */
	273	static void thread_func(void *data)
	274	{
	275	struct databag *mydata = data;
	276	uint8_t buf[BUFSIZE];
	277	uint64_t nb_to_send = 0;
	278	int bytes_written;
	279
	280	double time_cur, time_last, time_diff;
	281
	282	time_last = g_timer_elapsed(mydata->timer, NULL);
	283
	284	while (thread_running) {
	285	/* Rate control */
	286	time_cur = g_timer_elapsed(mydata->timer, NULL);
	287
	288	time_diff = time_cur - time_last;
	289	time_last = time_cur;
	290
	291	nb_to_send = cur_samplerate * time_diff;
	292
	293	if (limit_samples)
	294	nb_to_send = MIN(nb_to_send,
	295	limit_samples - mydata->samples_counter);
	296
	297	/* Make sure we don't overflow. */
	298	nb_to_send = MIN(nb_to_send, BUFSIZE);
	299
	300	if (nb_to_send) {
	301	samples_generator(buf, nb_to_send, data);
	302	mydata->samples_counter += nb_to_send;
	303
	304	g_io_channel_write_chars(channels[1], (gchar *)&buf,
	305	nb_to_send, (gsize *)&bytes_written, NULL);
	306	}
	307
	308	/* Check if we're done. */
	309	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	310	(limit_samples && mydata->samples_counter >= limit_samples))
	311	{
	312	close(mydata->pipe_fds[1]);
	313	thread_running = 0;
	314	}
	315
	316	g_usleep(10);
	317	}
	318	}
	319
	320	/* Callback handling data */
	321	static int receive_data(int fd, int revents, void *user_data)
	322	{
	323	struct sr_datafeed_packet packet;
	324	char c[BUFSIZE];
	325	gsize z;
	326
	327	/* Avoid compiler warnings. */
	328	fd = fd;
	329	revents = revents;
	330
	331	do {
	332	g_io_channel_read_chars(channels[0],
	333	(gchar *)&c, BUFSIZE, &z, NULL);
	334
	335	if (z > 0) {
	336	packet.type = SR_DF_LOGIC;
	337	packet.length = z;
	338	packet.unitsize = 1;
	339	packet.payload = c;
	340	sr_session_bus(user_data, &packet);
	341	}
	342	} while (z > 0);
	343
	344	if (!thread_running && z <= 0)
	345	{
	346	/* Make sure we don't receive more packets */
	347	g_io_channel_close(channels[0]);
	348
	349	/* Send last packet. */
	350	packet.type = SR_DF_END;
	351	sr_session_bus(user_data, &packet);
	352
	353	return FALSE;
	354	}
	355
	356	return TRUE;
	357	}
	358
	359	static int hw_start_acquisition(int device_index, gpointer session_device_id)
	360	{
	361	struct sr_datafeed_packet *packet;
	362	struct sr_datafeed_header *header;
	363	struct databag *mydata;
	364
	365	/* TODO: 'mydata' is never g_free()'d? */
	366	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
	367	sr_err("demo: %s: mydata malloc failed", __func__);
	368	return SR_ERR_MALLOC;
	369	}
	370
	371	mydata->sample_generator = default_genmode;
	372	mydata->session_device_id = session_device_id;
	373	mydata->device_index = device_index;
	374	mydata->samples_counter = 0;
	375
	376	if (pipe(mydata->pipe_fds))
	377	return SR_ERR;
	378
	379	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	380	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
	381
	382	/* Set channel encoding to binary (default is UTF-8). */
	383	g_io_channel_set_encoding(channels[0], NULL, NULL);
	384	g_io_channel_set_encoding(channels[1], NULL, NULL);
	385
	386	/* Make channels to unbuffered. */
	387	g_io_channel_set_buffered(channels[0], FALSE);
	388	g_io_channel_set_buffered(channels[1], FALSE);
	389
	390	sr_source_add(mydata->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	391	receive_data, session_device_id);
	392
	393	/* Run the demo thread. */
	394	g_thread_init(NULL);
	395	/* this needs to be done between g_thread_init() and g_thread_create() */
	396	mydata->timer = g_timer_new();
	397	thread_running = 1;
	398	my_thread =
	399	g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	400	if (!my_thread)
	401	return SR_ERR;
	402
	403	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	404	sr_err("demo: %s: packet malloc failed", __func__);
	405	return SR_ERR_MALLOC;
	406	}
	407
	408	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	409	sr_err("demo: %s: header malloc failed", __func__);
	410	return SR_ERR_MALLOC;
	411	}
	412
	413	packet->type = SR_DF_HEADER;
	414	packet->length = sizeof(struct sr_datafeed_header);
	415	packet->payload = (unsigned char *)header;
	416	header->feed_version = 1;
	417	gettimeofday(&header->starttime, NULL);
	418	header->samplerate = cur_samplerate;
	419	header->protocol_id = SR_PROTO_RAW;
	420	header->num_logic_probes = NUM_PROBES;
	421	header->num_analog_probes = 0;
	422	sr_session_bus(session_device_id, packet);
	423	g_free(header);
	424	g_free(packet);
	425
	426	return SR_OK;
	427	}
	428
	429	static void hw_stop_acquisition(int device_index, gpointer session_device_id)
	430	{
	431	/* Avoid compiler warnings. */
	432	device_index = device_index;
	433	session_device_id = session_device_id;
	434
	435	/* Stop generate thread. */
	436	thread_running = 0;
	437	}
	438
	439	struct sr_device_plugin demo_plugin_info = {
	440	.name = "demo",
	441	.longname = "Demo driver and pattern generator",
	442	.api_version = 1,
	443	.init = hw_init,
	444	.cleanup = hw_cleanup,
	445	.opendev = hw_opendev,
	446	.closedev = hw_closedev,
	447	.get_device_info = hw_get_device_info,
	448	.get_status = hw_get_status,
	449	.get_capabilities = hw_get_capabilities,
	450	.set_configuration = hw_set_configuration,
	451	.start_acquisition = hw_start_acquisition,
	452	.stop_acquisition = hw_stop_acquisition,
	453	};