[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 "config.h"
#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. */
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_data;
	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 *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_device_instance, maintained by opendev()/closedev(). */
static GSList *device_instances = NULL;
static uint64_t cur_samplerate = SR_KHZ(200);
static uint64_t period_ps = 5000000;
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 void hw_stop_acquisition(int device_index, gpointer session_data);

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

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

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

	device_instances = g_slist_append(device_instances, sdi);

	return 1;
}

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

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_closedev(int device_index)
{
	/* Avoid compiler warnings. */
	(void)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))) {
		sr_err("demo: %s: sdi was NULL", __func__);
		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_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 device_index)
{
	/* Avoid compiler warnings. */
	(void)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. */
	(void)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;
		period_ps = 1000000000000 / cur_samplerate;
		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;
		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;
			packet.timeoffset =  samples_received * period_ps;
			packet.duration = z * period_ps;
			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 device_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->device_index = device_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;
	packet->timeoffset = 0;
	packet->duration = 0;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	header->samplerate = cur_samplerate;
	header->num_logic_probes = NUM_PROBES;
	header->num_analog_probes = 0;
	sr_session_bus(session_data, packet);
	g_free(header);
	g_free(packet);

	return SR_OK;
}

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

	/* 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	#ifdef _WIN32
	26	#include <io.h>
	27	#include <fcntl.h>
	28	#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
	29	#endif
	30	#include "config.h"
	31	#include "sigrok.h"
	32	#include "sigrok-internal.h"
	33
	34	/* TODO: Number of probes should be configurable. */
	35	#define NUM_PROBES 8
	36
	37	#define DEMONAME "Demo device"
	38
	39	/* The size of chunks to send through the session bus. */
	40	/* TODO: Should be configurable. */
	41	#define BUFSIZE 4096
	42
	43	/* Supported patterns which we can generate */
	44	enum {
	45	/**
	46	* Pattern which spells "sigrok" using '0's (with '1's as "background")
	47	* when displayed using the 'bits' output format.
	48	*/
	49	PATTERN_SIGROK,
	50
	51	/** Pattern which consists of (pseudo-)random values on all probes. */
	52	PATTERN_RANDOM,
	53
	54	/**
	55	* Pattern which consists of incrementing numbers.
	56	* TODO: Better description.
	57	*/
	58	PATTERN_INC,
	59
	60	/** Pattern where all probes have a low logic state. */
	61	PATTERN_ALL_LOW,
	62
	63	/** Pattern where all probes have a high logic state. */
	64	PATTERN_ALL_HIGH,
	65	};
	66
	67	/* FIXME: Should not be global. */
	68	GIOChannel *channels[2];
	69
	70	struct databag {
	71	int pipe_fds[2];
	72	uint8_t sample_generator;
	73	uint8_t thread_running;
	74	uint64_t samples_counter;
	75	int device_index;
	76	gpointer session_data;
	77	GTimer *timer;
	78	};
	79
	80	static int capabilities[] = {
	81	SR_HWCAP_LOGIC_ANALYZER,
	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_device_instance, maintained by opendev()/closedev(). */
	129	static GSList *device_instances = NULL;
	130	static uint64_t cur_samplerate = SR_KHZ(200);
	131	static uint64_t period_ps = 5000000;
	132	static uint64_t limit_samples = 0;
	133	static uint64_t limit_msec = 0;
	134	static int default_pattern = PATTERN_SIGROK;
	135	static GThread *my_thread;
	136	static int thread_running;
	137
	138	static void hw_stop_acquisition(int device_index, gpointer session_data);
	139
	140	static int hw_init(const char *deviceinfo)
	141	{
	142	struct sr_device_instance *sdi;
	143
	144	/* Avoid compiler warnings. */
	145	(void)deviceinfo;
	146
	147	sdi = sr_device_instance_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	148	if (!sdi) {
	149	sr_err("demo: %s: sr_device_instance_new failed", __func__);
	150	return 0;
	151	}
	152
	153	device_instances = g_slist_append(device_instances, sdi);
	154
	155	return 1;
	156	}
	157
	158	static int hw_opendev(int device_index)
	159	{
	160	/* Avoid compiler warnings. */
	161	(void)device_index;
	162
	163	/* Nothing needed so far. */
	164
	165	return SR_OK;
	166	}
	167
	168	static int hw_closedev(int device_index)
	169	{
	170	/* Avoid compiler warnings. */
	171	(void)device_index;
	172
	173	/* Nothing needed so far. */
	174
	175	return SR_OK;
	176	}
	177
	178	static void hw_cleanup(void)
	179	{
	180	/* Nothing needed so far. */
	181	}
	182
	183	static void *hw_get_device_info(int device_index, int device_info_id)
	184	{
	185	struct sr_device_instance *sdi;
	186	void *info = NULL;
	187
	188	if (!(sdi = sr_get_device_instance(device_instances, device_index))) {
	189	sr_err("demo: %s: sdi was NULL", __func__);
	190	return NULL;
	191	}
	192
	193	switch (device_info_id) {
	194	case SR_DI_INSTANCE:
	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 device_index)
	218	{
	219	/* Avoid compiler warnings. */
	220	(void)device_index;
	221
	222	return SR_ST_ACTIVE;
	223	}
	224
	225	static int *hw_get_capabilities(void)
	226	{
	227	return capabilities;
	228	}
	229
	230	static int hw_set_configuration(int device_index, int capability, void *value)
	231	{
	232	int ret;
	233	char *stropt;
	234
	235	/* Avoid compiler warnings. */
	236	(void)device_index;
	237
	238	if (capability == SR_HWCAP_PROBECONFIG) {
	239	/* Nothing to do, but must be supported */
	240	ret = SR_OK;
	241	} else if (capability == SR_HWCAP_SAMPLERATE) {
	242	cur_samplerate = (uint64_t )value;
	243	period_ps = 1000000000000 / cur_samplerate;
	244	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	245	cur_samplerate);
	246	ret = SR_OK;
	247	} else if (capability == SR_HWCAP_LIMIT_SAMPLES) {
	248	limit_samples = (uint64_t )value;
	249	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	250	limit_samples);
	251	ret = SR_OK;
	252	} else if (capability == SR_HWCAP_LIMIT_MSEC) {
	253	limit_msec = (uint64_t )value;
	254	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	255	limit_msec);
	256	ret = SR_OK;
	257	} else if (capability == SR_HWCAP_PATTERN_MODE) {
	258	stropt = value;
	259	ret = SR_OK;
	260	if (!strcmp(stropt, "sigrok")) {
	261	default_pattern = PATTERN_SIGROK;
	262	} else if (!strcmp(stropt, "random")) {
	263	default_pattern = PATTERN_RANDOM;
	264	} else if (!strcmp(stropt, "incremental")) {
	265	default_pattern = PATTERN_INC;
	266	} else if (!strcmp(stropt, "all-low")) {
	267	default_pattern = PATTERN_ALL_LOW;
	268	} else if (!strcmp(stropt, "all-high")) {
	269	default_pattern = PATTERN_ALL_HIGH;
	270	} else {
	271	ret = SR_ERR;
	272	}
	273	sr_dbg("demo: %s: setting pattern to %d", __func__,
	274	default_pattern);
	275	} else {
	276	ret = SR_ERR;
	277	}
	278
	279	return ret;
	280	}
	281
	282	static void samples_generator(uint8_t buf, uint64_t size, void data)
	283	{
	284	static uint64_t p = 0;
	285	struct databag *mydata = data;
	286	uint64_t i;
	287
	288	/* TODO: Needed? */
	289	memset(buf, 0, size);
	290
	291	switch (mydata->sample_generator) {
	292	case PATTERN_SIGROK: /* sigrok pattern */
	293	for (i = 0; i < size; i++) {
	294	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	295	if (++p == 64)
	296	p = 0;
	297	}
	298	break;
	299	case PATTERN_RANDOM: /* Random */
	300	for (i = 0; i < size; i++)
	301	*(buf + i) = (uint8_t)(rand() & 0xff);
	302	break;
	303	case PATTERN_INC: /* Simple increment */
	304	for (i = 0; i < size; i++)
	305	*(buf + i) = i;
	306	break;
	307	case PATTERN_ALL_LOW: /* All probes are low */
	308	memset(buf, 0x00, size);
	309	break;
	310	case PATTERN_ALL_HIGH: /* All probes are high */
	311	memset(buf, 0xff, size);
	312	break;
	313	default:
	314	/* TODO: Error handling. */
	315	break;
	316	}
	317	}
	318
	319	/* Thread function */
	320	static void thread_func(void *data)
	321	{
	322	struct databag *mydata = data;
	323	uint8_t buf[BUFSIZE];
	324	uint64_t nb_to_send = 0;
	325	int bytes_written;
	326	double time_cur, time_last, time_diff;
	327
	328	time_last = g_timer_elapsed(mydata->timer, NULL);
	329
	330	while (thread_running) {
	331	/* Rate control */
	332	time_cur = g_timer_elapsed(mydata->timer, NULL);
	333
	334	time_diff = time_cur - time_last;
	335	time_last = time_cur;
	336
	337	nb_to_send = cur_samplerate * time_diff;
	338
	339	if (limit_samples) {
	340	nb_to_send = MIN(nb_to_send,
	341	limit_samples - mydata->samples_counter);
	342	}
	343
	344	/* Make sure we don't overflow. */
	345	nb_to_send = MIN(nb_to_send, BUFSIZE);
	346
	347	if (nb_to_send) {
	348	samples_generator(buf, nb_to_send, data);
	349	mydata->samples_counter += nb_to_send;
	350
	351	g_io_channel_write_chars(channels[1], (gchar *)&buf,
	352	nb_to_send, (gsize *)&bytes_written, NULL);
	353	}
	354
	355	/* Check if we're done. */
	356	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	357	(limit_samples && mydata->samples_counter >= limit_samples))
	358	{
	359	close(mydata->pipe_fds[1]);
	360	thread_running = 0;
	361	}
	362
	363	g_usleep(10);
	364	}
	365	}
	366
	367	/* Callback handling data */
	368	static int receive_data(int fd, int revents, void *session_data)
	369	{
	370	struct sr_datafeed_packet packet;
	371	struct sr_datafeed_logic logic;
	372	static uint64_t samples_received = 0;
	373	unsigned char c[BUFSIZE];
	374	gsize z;
	375
	376	/* Avoid compiler warnings. */
	377	(void)fd;
	378	(void)revents;
	379
	380	do {
	381	g_io_channel_read_chars(channels[0],
	382	(gchar *)&c, BUFSIZE, &z, NULL);
	383
	384	if (z > 0) {
	385	packet.type = SR_DF_LOGIC;
	386	packet.payload = &logic;
	387	packet.timeoffset = samples_received * period_ps;
	388	packet.duration = z * period_ps;
	389	logic.length = z;
	390	logic.unitsize = 1;
	391	logic.data = c;
	392	sr_session_bus(session_data, &packet);
	393	samples_received += z;
	394	}
	395	} while (z > 0);
	396
	397	if (!thread_running && z <= 0) {
	398	/* Make sure we don't receive more packets. */
	399	g_io_channel_close(channels[0]);
	400
	401	/* Send last packet. */
	402	packet.type = SR_DF_END;
	403	sr_session_bus(session_data, &packet);
	404
	405	return FALSE;
	406	}
	407
	408	return TRUE;
	409	}
	410
	411	static int hw_start_acquisition(int device_index, gpointer session_data)
	412	{
	413	struct sr_datafeed_packet *packet;
	414	struct sr_datafeed_header *header;
	415	struct databag *mydata;
	416
	417	/* TODO: 'mydata' is never g_free()'d? */
	418	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
	419	sr_err("demo: %s: mydata malloc failed", __func__);
	420	return SR_ERR_MALLOC;
	421	}
	422
	423	mydata->sample_generator = default_pattern;
	424	mydata->session_data = session_data;
	425	mydata->device_index = device_index;
	426	mydata->samples_counter = 0;
	427
	428	if (pipe(mydata->pipe_fds)) {
	429	/* TODO: Better error message. */
	430	sr_err("demo: %s: pipe() failed", __func__);
	431	return SR_ERR;
	432	}
	433
	434	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	435	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
	436
	437	/* Set channel encoding to binary (default is UTF-8). */
	438	g_io_channel_set_encoding(channels[0], NULL, NULL);
	439	g_io_channel_set_encoding(channels[1], NULL, NULL);
	440
	441	/* Make channels to unbuffered. */
	442	g_io_channel_set_buffered(channels[0], FALSE);
	443	g_io_channel_set_buffered(channels[1], FALSE);
	444
	445	sr_source_add(mydata->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	446	receive_data, session_data);
	447
	448	/* Run the demo thread. */
	449	g_thread_init(NULL);
	450	/* This must to be done between g_thread_init() & g_thread_create(). */
	451	mydata->timer = g_timer_new();
	452	thread_running = 1;
	453	my_thread =
	454	g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	455	if (!my_thread) {
	456	sr_err("demo: %s: g_thread_create failed", __func__);
	457	return SR_ERR; /* TODO */
	458	}
	459
	460	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	461	sr_err("demo: %s: packet malloc failed", __func__);
	462	return SR_ERR_MALLOC;
	463	}
	464
	465	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	466	sr_err("demo: %s: header malloc failed", __func__);
	467	return SR_ERR_MALLOC;
	468	}
	469
	470	packet->type = SR_DF_HEADER;
	471	packet->payload = header;
	472	packet->timeoffset = 0;
	473	packet->duration = 0;
	474	header->feed_version = 1;
	475	gettimeofday(&header->starttime, NULL);
	476	header->samplerate = cur_samplerate;
	477	header->num_logic_probes = NUM_PROBES;
	478	header->num_analog_probes = 0;
	479	sr_session_bus(session_data, packet);
	480	g_free(header);
	481	g_free(packet);
	482
	483	return SR_OK;
	484	}
	485
	486	static void hw_stop_acquisition(int device_index, gpointer session_data)
	487	{
	488	/* Avoid compiler warnings. */
	489	(void)device_index;
	490	(void)session_data;
	491
	492	/* Stop generate thread. */
	493	thread_running = 0;
	494	}
	495
	496	struct sr_device_plugin demo_plugin_info = {
	497	.name = "demo",
	498	.longname = "Demo driver and pattern generator",
	499	.api_version = 1,
	500	.init = hw_init,
	501	.cleanup = hw_cleanup,
	502	.opendev = hw_opendev,
	503	.closedev = hw_closedev,
	504	.get_device_info = hw_get_device_info,
	505	.get_status = hw_get_status,
	506	.get_capabilities = hw_get_capabilities,
	507	.set_configuration = hw_set_configuration,
	508	.start_acquisition = hw_start_acquisition,
	509	.stop_acquisition = hw_stop_acquisition,
	510	};