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

/* 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,
};

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

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

static 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 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,
};

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,
};

/* List of struct sr_dev_inst, maintained by opendev()/closedev(). */
static GSList *dev_insts = NULL;
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 GThread *my_thread;
static int thread_running;

static int hw_stop_acquisition(int dev_index, gpointer session_data);

static int hw_init(const char *devinfo)
{
	struct sr_dev_inst *sdi;

	/* Avoid compiler warnings. */
	(void)devinfo;

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

	dev_insts = g_slist_append(dev_insts, sdi);

	return 1;
}

static int hw_opendev(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_closedev(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	/* Nothing needed so far. */

	return SR_OK;
}

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

static void *hw_get_dev_info(int dev_index, int dev_info_id)
{
	struct sr_dev_inst *sdi;
	void *info = NULL;

	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
		sr_err("demo: %s: sdi was NULL", __func__);
		return NULL;
	}

	switch (dev_info_id) {
	case SR_DI_INST:
		info = sdi;
		break;
	case SR_DI_NUM_PROBES:
		info = GINT_TO_POINTER(NUM_PROBES);
		break;
	case SR_DI_PROBE_NAMES:
		info = probe_names;
		break;
	case SR_DI_SAMPLERATES:
		info = &samplerates;
		break;
	case SR_DI_CUR_SAMPLERATE:
		info = &cur_samplerate;
		break;
	case SR_DI_PATTERNMODES:
		info = &pattern_strings;
		break;
	}

	return info;
}

static int hw_get_status(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	return SR_ST_ACTIVE;
}

static int *hw_hwcap_get_all(void)
{
	return hwcaps;
}

static int hw_config_set(int dev_index, int hwcap, void *value)
{
	int ret;
	char *stropt;

	/* Avoid compiler warnings. */
	(void)dev_index;

	if (hwcap == SR_HWCAP_PROBECONFIG) {
		/* Nothing to do, but must be supported */
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_SAMPLERATE) {
		cur_samplerate = *(uint64_t *)value;
		sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
		       cur_samplerate);
		ret = SR_OK;
	} else if (hwcap == 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 (hwcap == 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 (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("demo: %s: setting pattern to %d", __func__,
		       default_pattern);
	} 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;

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

	switch (mydata->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:
		/* TODO: Error handling. */
		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 *session_data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	static uint64_t samples_received = 0;
	unsigned char c[BUFSIZE];
	gsize z;

	/* Avoid compiler warnings. */
	(void)fd;
	(void)revents;

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

		if (z > 0) {
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			logic.length = z;
			logic.unitsize = 1;
			logic.data = c;
			sr_session_bus(session_data, &packet);
			samples_received += z;
		}
	} 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(session_data, &packet);

		return FALSE;
	}

	return TRUE;
}

static int hw_start_acquisition(int dev_index, gpointer session_data)
{
	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_pattern;
	mydata->session_data = session_data;
	mydata->dev_index = dev_index;
	mydata->samples_counter = 0;

	if (pipe(mydata->pipe_fds)) {
		/* TODO: Better error message. */
		sr_err("demo: %s: pipe() failed", __func__);
		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_data);

	/* Run the demo thread. */
	g_thread_init(NULL);
	/* This must to be done between g_thread_init() & 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) {
		sr_err("demo: %s: g_thread_create failed", __func__);
		return SR_ERR; /* TODO */
	}

	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->payload = header;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	header->samplerate = cur_samplerate;
	header->num_logic_probes = NUM_PROBES;
	sr_session_bus(session_data, packet);
	g_free(header);
	g_free(packet);

	return SR_OK;
}

static int hw_stop_acquisition(int dev_index, gpointer session_data)
{
	/* Avoid compiler warnings. */
	(void)dev_index;
	(void)session_data;

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

	return SR_OK;
}

SR_PRIV struct sr_dev_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_dev_info = hw_get_dev_info,
	.get_status = hw_get_status,
	.hwcap_get_all = hw_hwcap_get_all,
	.config_set = hw_config_set,
	.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	#ifdef _WIN32
	26	#include <io.h>
	27	#include <fcntl.h>
	28	#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
	29	#endif
	30	#include "sigrok.h"
	31	#include "sigrok-internal.h"
	32
	33	/* TODO: Number of probes should be configurable. */
	34	#define NUM_PROBES 8
	35
	36	#define DEMONAME "Demo device"
	37
	38	/* The size of chunks to send through the session bus. */
	39	/* TODO: Should be configurable. */
	40	#define BUFSIZE 4096
	41
	42	/* Supported patterns which we can generate */
	43	enum {
	44	/**
	45	* Pattern which spells "sigrok" using '0's (with '1's as "background")
	46	* when displayed using the 'bits' output format.
	47	*/
	48	PATTERN_SIGROK,
	49
	50	/** Pattern which consists of (pseudo-)random values on all probes. */
	51	PATTERN_RANDOM,
	52
	53	/**
	54	* Pattern which consists of incrementing numbers.
	55	* TODO: Better description.
	56	*/
	57	PATTERN_INC,
	58
	59	/** Pattern where all probes have a low logic state. */
	60	PATTERN_ALL_LOW,
	61
	62	/** Pattern where all probes have a high logic state. */
	63	PATTERN_ALL_HIGH,
	64	};
	65
	66	/* FIXME: Should not be global. */
	67	SR_PRIV GIOChannel *channels[2];
	68
	69	struct databag {
	70	int pipe_fds[2];
	71	uint8_t sample_generator;
	72	uint8_t thread_running;
	73	uint64_t samples_counter;
	74	int dev_index;
	75	gpointer session_data;
	76	GTimer *timer;
	77	};
	78
	79	static int hwcaps[] = {
	80	SR_HWCAP_LOGIC_ANALYZER,
	81	SR_HWCAP_DEMO_DEV,
	82	SR_HWCAP_SAMPLERATE,
	83	SR_HWCAP_PATTERN_MODE,
	84	SR_HWCAP_LIMIT_SAMPLES,
	85	SR_HWCAP_LIMIT_MSEC,
	86	SR_HWCAP_CONTINUOUS,
	87	};
	88
	89	static struct sr_samplerates samplerates = {
	90	SR_HZ(1),
	91	SR_GHZ(1),
	92	SR_HZ(1),
	93	NULL,
	94	};
	95
	96	static const char *pattern_strings[] = {
	97	"sigrok",
	98	"random",
	99	"incremental",
	100	"all-low",
	101	"all-high",
	102	NULL,
	103	};
	104
	105	static const char *probe_names[NUM_PROBES + 1] = {
	106	"0",
	107	"1",
	108	"2",
	109	"3",
	110	"4",
	111	"5",
	112	"6",
	113	"7",
	114	NULL,
	115	};
	116
	117	static uint8_t pattern_sigrok[] = {
	118	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	119	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	120	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	121	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	122	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	123	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	124	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	125	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	126	};
	127
	128	/* List of struct sr_dev_inst, maintained by opendev()/closedev(). */
	129	static GSList *dev_insts = NULL;
	130	static uint64_t cur_samplerate = SR_KHZ(200);
	131	static uint64_t limit_samples = 0;
	132	static uint64_t limit_msec = 0;
	133	static int default_pattern = PATTERN_SIGROK;
	134	static GThread *my_thread;
	135	static int thread_running;
	136
	137	static int hw_stop_acquisition(int dev_index, gpointer session_data);
	138
	139	static int hw_init(const char *devinfo)
	140	{
	141	struct sr_dev_inst *sdi;
	142
	143	/* Avoid compiler warnings. */
	144	(void)devinfo;
	145
	146	sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	147	if (!sdi) {
	148	sr_err("demo: %s: sr_dev_inst_new failed", __func__);
	149	return 0;
	150	}
	151
	152	dev_insts = g_slist_append(dev_insts, sdi);
	153
	154	return 1;
	155	}
	156
	157	static int hw_opendev(int dev_index)
	158	{
	159	/* Avoid compiler warnings. */
	160	(void)dev_index;
	161
	162	/* Nothing needed so far. */
	163
	164	return SR_OK;
	165	}
	166
	167	static int hw_closedev(int dev_index)
	168	{
	169	/* Avoid compiler warnings. */
	170	(void)dev_index;
	171
	172	/* Nothing needed so far. */
	173
	174	return SR_OK;
	175	}
	176
	177	static int hw_cleanup(void)
	178	{
	179	/* Nothing needed so far. */
	180	return SR_OK;
	181	}
	182
	183	static void *hw_get_dev_info(int dev_index, int dev_info_id)
	184	{
	185	struct sr_dev_inst *sdi;
	186	void *info = NULL;
	187
	188	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
	189	sr_err("demo: %s: sdi was NULL", __func__);
	190	return NULL;
	191	}
	192
	193	switch (dev_info_id) {
	194	case SR_DI_INST:
	195	info = sdi;
	196	break;
	197	case SR_DI_NUM_PROBES:
	198	info = GINT_TO_POINTER(NUM_PROBES);
	199	break;
	200	case SR_DI_PROBE_NAMES:
	201	info = probe_names;
	202	break;
	203	case SR_DI_SAMPLERATES:
	204	info = &samplerates;
	205	break;
	206	case SR_DI_CUR_SAMPLERATE:
	207	info = &cur_samplerate;
	208	break;
	209	case SR_DI_PATTERNMODES:
	210	info = &pattern_strings;
	211	break;
	212	}
	213
	214	return info;
	215	}
	216
	217	static int hw_get_status(int dev_index)
	218	{
	219	/* Avoid compiler warnings. */
	220	(void)dev_index;
	221
	222	return SR_ST_ACTIVE;
	223	}
	224
	225	static int *hw_hwcap_get_all(void)
	226	{
	227	return hwcaps;
	228	}
	229
	230	static int hw_config_set(int dev_index, int hwcap, void *value)
	231	{
	232	int ret;
	233	char *stropt;
	234
	235	/* Avoid compiler warnings. */
	236	(void)dev_index;
	237
	238	if (hwcap == SR_HWCAP_PROBECONFIG) {
	239	/* Nothing to do, but must be supported */
	240	ret = SR_OK;
	241	} else if (hwcap == SR_HWCAP_SAMPLERATE) {
	242	cur_samplerate = (uint64_t )value;
	243	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	244	cur_samplerate);
	245	ret = SR_OK;
	246	} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
	247	limit_samples = (uint64_t )value;
	248	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	249	limit_samples);
	250	ret = SR_OK;
	251	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
	252	limit_msec = (uint64_t )value;
	253	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	254	limit_msec);
	255	ret = SR_OK;
	256	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
	257	stropt = value;
	258	ret = SR_OK;
	259	if (!strcmp(stropt, "sigrok")) {
	260	default_pattern = PATTERN_SIGROK;
	261	} else if (!strcmp(stropt, "random")) {
	262	default_pattern = PATTERN_RANDOM;
	263	} else if (!strcmp(stropt, "incremental")) {
	264	default_pattern = PATTERN_INC;
	265	} else if (!strcmp(stropt, "all-low")) {
	266	default_pattern = PATTERN_ALL_LOW;
	267	} else if (!strcmp(stropt, "all-high")) {
	268	default_pattern = PATTERN_ALL_HIGH;
	269	} else {
	270	ret = SR_ERR;
	271	}
	272	sr_dbg("demo: %s: setting pattern to %d", __func__,
	273	default_pattern);
	274	} else {
	275	ret = SR_ERR;
	276	}
	277
	278	return ret;
	279	}
	280
	281	static void samples_generator(uint8_t buf, uint64_t size, void data)
	282	{
	283	static uint64_t p = 0;
	284	struct databag *mydata = data;
	285	uint64_t i;
	286
	287	/* TODO: Needed? */
	288	memset(buf, 0, size);
	289
	290	switch (mydata->sample_generator) {
	291	case PATTERN_SIGROK: /* sigrok pattern */
	292	for (i = 0; i < size; i++) {
	293	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	294	if (++p == 64)
	295	p = 0;
	296	}
	297	break;
	298	case PATTERN_RANDOM: /* Random */
	299	for (i = 0; i < size; i++)
	300	*(buf + i) = (uint8_t)(rand() & 0xff);
	301	break;
	302	case PATTERN_INC: /* Simple increment */
	303	for (i = 0; i < size; i++)
	304	*(buf + i) = i;
	305	break;
	306	case PATTERN_ALL_LOW: /* All probes are low */
	307	memset(buf, 0x00, size);
	308	break;
	309	case PATTERN_ALL_HIGH: /* All probes are high */
	310	memset(buf, 0xff, size);
	311	break;
	312	default:
	313	/* TODO: Error handling. */
	314	break;
	315	}
	316	}
	317
	318	/* Thread function */
	319	static void thread_func(void *data)
	320	{
	321	struct databag *mydata = data;
	322	uint8_t buf[BUFSIZE];
	323	uint64_t nb_to_send = 0;
	324	int bytes_written;
	325	double time_cur, time_last, time_diff;
	326
	327	time_last = g_timer_elapsed(mydata->timer, NULL);
	328
	329	while (thread_running) {
	330	/* Rate control */
	331	time_cur = g_timer_elapsed(mydata->timer, NULL);
	332
	333	time_diff = time_cur - time_last;
	334	time_last = time_cur;
	335
	336	nb_to_send = cur_samplerate * time_diff;
	337
	338	if (limit_samples) {
	339	nb_to_send = MIN(nb_to_send,
	340	limit_samples - mydata->samples_counter);
	341	}
	342
	343	/* Make sure we don't overflow. */
	344	nb_to_send = MIN(nb_to_send, BUFSIZE);
	345
	346	if (nb_to_send) {
	347	samples_generator(buf, nb_to_send, data);
	348	mydata->samples_counter += nb_to_send;
	349
	350	g_io_channel_write_chars(channels[1], (gchar *)&buf,
	351	nb_to_send, (gsize *)&bytes_written, NULL);
	352	}
	353
	354	/* Check if we're done. */
	355	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	356	(limit_samples && mydata->samples_counter >= limit_samples))
	357	{
	358	close(mydata->pipe_fds[1]);
	359	thread_running = 0;
	360	}
	361
	362	g_usleep(10);
	363	}
	364	}
	365
	366	/* Callback handling data */
	367	static int receive_data(int fd, int revents, void *session_data)
	368	{
	369	struct sr_datafeed_packet packet;
	370	struct sr_datafeed_logic logic;
	371	static uint64_t samples_received = 0;
	372	unsigned char c[BUFSIZE];
	373	gsize z;
	374
	375	/* Avoid compiler warnings. */
	376	(void)fd;
	377	(void)revents;
	378
	379	do {
	380	g_io_channel_read_chars(channels[0],
	381	(gchar *)&c, BUFSIZE, &z, NULL);
	382
	383	if (z > 0) {
	384	packet.type = SR_DF_LOGIC;
	385	packet.payload = &logic;
	386	logic.length = z;
	387	logic.unitsize = 1;
	388	logic.data = c;
	389	sr_session_bus(session_data, &packet);
	390	samples_received += z;
	391	}
	392	} while (z > 0);
	393
	394	if (!thread_running && z <= 0) {
	395	/* Make sure we don't receive more packets. */
	396	g_io_channel_close(channels[0]);
	397
	398	/* Send last packet. */
	399	packet.type = SR_DF_END;
	400	sr_session_bus(session_data, &packet);
	401
	402	return FALSE;
	403	}
	404
	405	return TRUE;
	406	}
	407
	408	static int hw_start_acquisition(int dev_index, gpointer session_data)
	409	{
	410	struct sr_datafeed_packet *packet;
	411	struct sr_datafeed_header *header;
	412	struct databag *mydata;
	413
	414	/* TODO: 'mydata' is never g_free()'d? */
	415	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
	416	sr_err("demo: %s: mydata malloc failed", __func__);
	417	return SR_ERR_MALLOC;
	418	}
	419
	420	mydata->sample_generator = default_pattern;
	421	mydata->session_data = session_data;
	422	mydata->dev_index = dev_index;
	423	mydata->samples_counter = 0;
	424
	425	if (pipe(mydata->pipe_fds)) {
	426	/* TODO: Better error message. */
	427	sr_err("demo: %s: pipe() failed", __func__);
	428	return SR_ERR;
	429	}
	430
	431	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	432	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
	433
	434	/* Set channel encoding to binary (default is UTF-8). */
	435	g_io_channel_set_encoding(channels[0], NULL, NULL);
	436	g_io_channel_set_encoding(channels[1], NULL, NULL);
	437
	438	/* Make channels to unbuffered. */
	439	g_io_channel_set_buffered(channels[0], FALSE);
	440	g_io_channel_set_buffered(channels[1], FALSE);
	441
	442	sr_source_add(mydata->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	443	receive_data, session_data);
	444
	445	/* Run the demo thread. */
	446	g_thread_init(NULL);
	447	/* This must to be done between g_thread_init() & g_thread_create(). */
	448	mydata->timer = g_timer_new();
	449	thread_running = 1;
	450	my_thread =
	451	g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	452	if (!my_thread) {
	453	sr_err("demo: %s: g_thread_create failed", __func__);
	454	return SR_ERR; /* TODO */
	455	}
	456
	457	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	458	sr_err("demo: %s: packet malloc failed", __func__);
	459	return SR_ERR_MALLOC;
	460	}
	461
	462	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	463	sr_err("demo: %s: header malloc failed", __func__);
	464	return SR_ERR_MALLOC;
	465	}
	466
	467	packet->type = SR_DF_HEADER;
	468	packet->payload = header;
	469	header->feed_version = 1;
	470	gettimeofday(&header->starttime, NULL);
	471	header->samplerate = cur_samplerate;
	472	header->num_logic_probes = NUM_PROBES;
	473	sr_session_bus(session_data, packet);
	474	g_free(header);
	475	g_free(packet);
	476
	477	return SR_OK;
	478	}
	479
	480	static int hw_stop_acquisition(int dev_index, gpointer session_data)
	481	{
	482	/* Avoid compiler warnings. */
	483	(void)dev_index;
	484	(void)session_data;
	485
	486	/* Stop generate thread. */
	487	thread_running = 0;
	488
	489	return SR_OK;
	490	}
	491
	492	SR_PRIV struct sr_dev_plugin demo_plugin_info = {
	493	.name = "demo",
	494	.longname = "Demo driver and pattern generator",
	495	.api_version = 1,
	496	.init = hw_init,
	497	.cleanup = hw_cleanup,
	498	.opendev = hw_opendev,
	499	.closedev = hw_closedev,
	500	.get_dev_info = hw_get_dev_info,
	501	.get_status = hw_get_status,
	502	.hwcap_get_all = hw_hwcap_get_all,
	503	.config_set = hw_config_set,
	504	.start_acquisition = hw_start_acquisition,
	505	.stop_acquisition = hw_stop_acquisition,
	506	};